Protoflow Review (2026): 14 Ingredients With Doses, Saw Palmetto at 84.5 mg

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By Mauro Costa · Updated November 8, 2026 · Prices checked November 8, 2026 · How we review

Protoflow is a two-capsule-a-day prostate support supplement sold on protoflow.net through ClickBank and distributed, per its label, by PhytoThrive Labs of Aurora, Colorado. Our Protoflow review in short: all 14 ingredients come with amounts, but saw palmetto and tribulus sit well below the trial doses we read, and the formula itself has no published trial.

Protoflow at a glance

Form	Capsules (60 per bottle)
Daily dose	2 capsules
Servings per bottle	30 (2 capsules/day)
Price from	$49 per bottle (6-bottle pack)
Cost per day	$1.63/day on the 6-bottle package
Money back guarantee	60 days
Recurring billing	None (one-time payment, per the sales page)
Seller	PhytoThrive Labs (distributor named on the label)
Made in	Not stated (the label gives an Aurora, CO distributor address)
Official domain	protoflow.net
Sold through	Official website via ClickBank
Last checked	November 8, 2026

What Is Protoflow and Why Is It Trending?

Protoflow is a capsule supplement sold as prostate support. The sales page calls it a “Vital prostate wellness formula” that “Supports the normal functions of the bladder, prostate and reproductive system.” Each bottle holds 60 capsules, and the label’s suggested use is two capsules a day with water, so one bottle lasts 30 days.

Why it’s on our radar: in our ClickBank marketplace snapshot of November 5, 2026, Protoflow had a gravity of 24.6, which put it at #29 of the 183 health offers we track. Gravity roughly reflects how many affiliates earned a commission from a product recently, so it tells you the product is being promoted, not that it works or how many people bought it. People also search Google for “protoflow reviews and complaints”, “protoflow side effects” and “protoflow ingredients list”, and this review answers each of those.

What stands out once you look closely: the sales page features eight herbs, but the Supplement Facts image on the same page lists 14 ingredients, including ginkgo, tribulus, vitamin E and niacin. That matters for safety, and we go through it below. We went by the written sales page, the label image and the refund and shipping pages; the vendor’s affiliate page mentions sales videos, which we didn’t review.

Protoflow Reviews and Complaints: What Buyers Report

We looked for buyer feedback on Trustpilot, Reddit, the BBB and Consumer Reports on November 8, 2026, and found almost nothing first-hand. protoflow.net has no Trustpilot profile (the address returns a not-found page). A Trustpilot profile for a different domain that uses the name, protoflowprostatesupplement.entrynutrition.com, shows zero reviews and says that website has closed. A Reddit-only search returned no threads about the supplement, and we found no BBB profile for Protoflow or for PhytoThrive Labs, the distributor named on the label.

Most of what turns up for “protoflow reviews and complaints” is affiliate content: uploaded PDFs, forum posts and news-site advertorials that link to the sales page. Those pages aren’t buyer feedback, so we left them out. The sales page says Protoflow has helped “thousands of our satisfied customers” and shows three five-star testimonials; we found nothing outside the vendor’s own pages that confirms a customer count or a rating.

Finding nothing is a finding, not a verdict: a launch with little third-party feedback simply gives you less to go on. If you buy, keep your order email and the refund steps from the price section below.

Reviews and complaints: where we looked

Where we looked	What we found	Checked
Trustpilot	None found. No Trustpilot page for protoflow.net (not found). A profile for another domain using the name shows 0 reviews and says that website has closed.	Nov 8, 2026
Reddit	None found. A Reddit-only web search returned no Reddit threads about the Protoflow supplement.	Nov 8, 2026
BBB	None found. A web search found no BBB profile for Protoflow or for PhytoThrive Labs, the distributor named on the label.	Nov 8, 2026
Consumer Reports	None found. No review of Protoflow on consumerreports.org.	Nov 8, 2026
Sales page claim vs what we saw	None found. The sales page says it helped thousands of satisfied customers and shows three five-star testimonials; we found no third-party reviews that confirm either.	Nov 8, 2026

We link each page and summarize what we saw. We don’t reproduce buyer reviews or testimonials.

Who Sells Protoflow? What We Could Verify

Protoflow is a real product sold through ClickBank with a 60-day refund policy and a published returns address, so it isn’t a fake storefront. Whether it works is a separate question: there’s no published trial of the formula.

Here is what we could check. The order buttons on protoflow.net lead to ClickBank’s order pages, and the site says ClickBank is the retailer of its products. The label image says “Distributed by: PhytoThrive Labs” at 19655 E 35th Dr #100, Aurora, CO 80011, the same address the refund policy gives for returns and calls a warehouse. The privacy policy names “Protoflow, Inc.” We didn’t look up a business registration, and an address on a label tells you where returns go, not who formulated the product or where it is made.

Many pages with “Protoflow review” in the title are affiliate pages on other domains. Our link goes to protoflow.net, the domain whose order buttons lead to the vendor’s ClickBank checkout.

What we could verify about Protoflow

What we checked	Status	Details
Official domain (where our link lands)	Yes	protoflow.net · source
Payment processor	Yes	ClickBank (the order buttons lead to ClickBank's checkout; the site names ClickBank as retailer) · source
Seller or company named	Yes	Label: Distributed by PhytoThrive Labs; the privacy policy names Protoflow, Inc. · source
Physical address	Yes	19655 E 35th Dr #100, Aurora, CO 80011 (label and returns address; the refund policy calls it a warehouse) · source
Refund policy page	Yes	60 days from receipt; buyer pays return shipping; refunds minus shipping fees · source
Recurring billing	No	Sales page FAQ: one-time payment, no other future payments · source
Doses / Supplement Facts shown	Yes	Supplement Facts image on the sales page: 14 ingredients with amounts per 2-capsule serving · source
Third-party reviews found	No	No Trustpilot reviews, Reddit threads or BBB profile found · source
Look-alike 'official site' pages seen in search	No	Search results showed affiliate review pages on other domains and a Trustpilot profile for another domain using the name; we didn't see one presented as the official site · source
Listed on Amazon/eBay/Walmart	Not checked	Amazon and Walmart pages didn't load for us (an error and a bot check)

We could check: official domain; payment processor; seller or company named; physical address; refund policy page; recurring billing; doses / Supplement Facts shown; third-party reviews found; look-alike 'official site' pages seen in search. We couldn’t check: listed on Amazon/eBay/Walmart. Checked November 8, 2026.

Checkout is handled by ClickBank, which acts as the retailer for products sold on its platform; refund requests can also go through ClickBank’s customer support.

Where to Buy Protoflow (Amazon, Walmart or the Official Site?)

The vendor sells Protoflow on protoflow.net with ClickBank checkout, in packs of 2, 3 or 6 bottles. We tried to check Amazon and Walmart on November 8, 2026, but their pages didn’t load for us (an error on Amazon and a bot check on Walmart), so we can’t say whether anyone lists it there. Web search results for Walmart showed other prostate products with similar-sounding names, which are different products.

Two things to know if you see it elsewhere: the vendor’s affiliate terms forbid promoting Protoflow on Amazon, eBay and other retail or auction sites, and the refund policy describes returns of orders shipped from the vendor’s own warehouse. A bottle bought from a third-party seller may not be covered by that refund policy.

How Protoflow Claims to Work

The sales page doesn’t describe a mechanism. Its headline is “TOP BENEFITS WITHOUT COMPROMISES WHEN IT COMES TO YOUR PROSTATE HEALTH”, and its main claims are that Protoflow is a “Vital prostate wellness formula” that “Supports the normal functions of the bladder, prostate and reproductive system”, with “Incredible results in RECORD TIME!” It then presents eight herbs, one by one: Chinese ginseng, cayenne, damiana, saw palmetto, muira puama, Epimedium, hawthorn and catuaba.

How those claims compare with the evidence: we found no trial of Protoflow at all, so nothing backs “results in record time”. The sales page’s own FAQ is more cautious, saying some people “may take longer to respond to the protocol than others”. Of the herbs it names, saw palmetto is the one most studied for urinary symptoms, and a Cochrane review found little to no difference from placebo in men with urinary symptoms from an enlarged prostate ^[1]. Ginseng and tribulus were studied mainly for sexual function, with small or mixed results ^{[2] [3]}. Hawthorn was studied in heart failure, not in the prostate ^[4].

The page also says the ingredients are prepared “in a FDA registered and inspected facility” and handled according to the USDA National Organic Program. Facility registration is a listing requirement, not an FDA approval of the product (the FDA doesn’t approve supplements), and the label image we read shows no organic certification. The site’s own disclaimer says its statements haven’t been evaluated by the FDA.

Protoflow Ingredients vs. the Research

Credit where it’s due: Protoflow shows every amount. The Supplement Facts image on the sales page (checked November 8, 2026) lists a 2-capsule serving with vitamin E 13 mg, niacin 75 mg, hawthorn fruit 250 mg, Epimedium sagittatum 250 mg, damiana leaf 200 mg, muira puama root 200 mg, ginkgo leaf 120 mg, Chinese ginseng root 120 mg, tribulus fruit 120 mg, catuaba bark 84.5 mg, saw palmetto fruit 84.5 mg, inosine 50 mg, oat straw 32 mg and cayenne 20 mg. That adds up to about 1.6 g of listed ingredients a day.

Six of those 14 aren’t in the sales page’s ingredient list: vitamin E, niacin, ginkgo, tribulus, inosine and oat straw. Every herb the sales page presents is on the label.

The comparison that matters most: the label’s saw palmetto is 84.5 mg, while the trial we read used 320 mg a day of saw palmetto extract ^[5], so Protoflow gives roughly a quarter of that. Tribulus is 120 mg, against 800 mg a day in the trial we read ^[3]. For hawthorn, ginseng, muira puama and catuaba, the studies used extracts, blends or doses that can’t be lined up with the label’s amounts. Damiana, Epimedium and cayenne had no human trials in our PubMed search.

Ingredient	Label dose	Dose in studies	What the research says	Evidence
Saw palmetto (fruit)	84.5 mg	320 mg/day of saw palmetto extract for 12 weeks [5]	In a 12-week trial in 68 healthy Japanese adults aged 50 or older bothered by frequent daytime urination, 320 mg/day of saw palmetto extract improved symptom bother and lowered daytime urination counts compared with placebo [5]. A 2023 Cochrane review of 27 trials in men with urinary symptoms from an enlarged prostate found little to no difference from placebo in symptom scores at 3-6 months and at 12-17 months (high-certainty evidence) [1].	Limited
Tribulus terrestris (fruit)	120 mg	800 mg/day for 30 days [3]	In a 30-day trial in 30 men aged 40 or older with erectile dysfunction, 800 mg/day was no better than placebo for erectile function scores or testosterone [3]. In a 3-month trial in 70 older men with partial androgen deficiency, testosterone and erectile function scores rose in the tribulus group, prostate symptom scores did not change, and average PSA and a liver enzyme rose slightly [10].	Limited
Hawthorn (fruit)	250 mg	900 mg/day of hawthorn extract (450 mg twice daily) for 6 months [9]	Hawthorn extract was studied in people with chronic heart failure, as an add-on to their usual medicines, not for the prostate. A meta-analysis of 8 trials (632 patients) found better exercise workload and symptoms than placebo [4], but a 6-month trial in 120 patients found no benefit on walking distance or quality of life and more adverse events with hawthorn [9].	Limited
Epimedium sagittatum (whole plant)	250 mg	No human studies found	Our PubMed search returned lab and animal studies of icariin, Epimedium’s main compound, but no human trial of Epimedium for the prostate, urination or sexual function.	Insufficient
Damiana (leaf)	200 mg	No human studies found	Damiana is a traditional plant aphrodisiac. Our PubMed search returned reviews of its traditional use and lab studies, but no human trial.	Insufficient
Muira puama (root)	200 mg	25 mL twice daily of a liquid blend with guarana, catuaba and ginger, for 28 days (a safety study) [13]	We found no trial of muira puama alone. A 28-day safety study gave healthy volunteers a Brazilian liquid blend of guarana, catuaba, muira puama and ginger and reported no severe adverse reactions or blood test changes [13]; it did not measure any benefit.	Insufficient
Ginkgo biloba (leaf)	120 mg	Not stated in the abstract we read	Not in the sales page’s ingredient list. We cite it for safety: a review lists bleeding with warfarin and ginkgo as a plausible herb-drug interaction [6], and in a large Veterans Administration record study, ginkgo use with warfarin went with more bleeding events (hazard ratio 1.38) [7].	Insufficient
Chinese ginseng (root)	120 mg	Not stated in the abstract we read	A 2021 Cochrane review of 9 trials in 587 men with mild to moderate erectile dysfunction found ginseng had only a trivial effect on erectile function scores versus placebo, though it may improve self-reported ability to have intercourse (mostly low-certainty evidence) [2]. The label doesn’t name the ginseng species.	Limited
Catuaba (bark)	84.5 mg	25 mL twice daily of a liquid blend with guarana, muira puama and ginger, for 28 days (a safety study) [13]	We found no trial of catuaba alone. The same 28-day safety study of a four-herb Brazilian blend that includes catuaba reported no severe adverse reactions in healthy volunteers [13]. The label doesn’t name the catuaba species.	Insufficient
Vitamin E (as d-alpha tocopheryl succinate)	13 mg (87% DV)	400 IU/day of synthetic vitamin E for 7-12 years [12]	In the SELECT trial of 34,887 healthy men, those given 400 IU a day of synthetic vitamin E were diagnosed with prostate cancer more often than men on placebo (hazard ratio 1.17) [12]. Protoflow’s 13 mg is a much smaller amount of a different form.	Insufficient
Niacin (vitamin B3)	75 mg (469% DV)	Not stated in the abstract we read	An overview of 14 reviews links oral niacin to stomach upset, flushing, skin rash, fatigue and liver problems, more often at higher doses [11]. We found no study of niacin for the prostate or urination.	Insufficient
Inosine	50 mg	Not checked for this review	Inosine isn’t named on the sales page, which gives no reason for including it; we didn’t search its research for this review.	Insufficient
Oat straw (stalks)	32 mg	1,500 mg/day of a wild green oat extract for 12 weeks, studied for thinking skills [14]	Green oat extracts were studied for mental performance, not the prostate: in a 12-week trial in 37 older adults, 1,500 mg/day did not change cognitive measures [14].	Insufficient
Cayenne (fruit)	20 mg	No human studies found	Our PubMed search found no human study of oral cayenne or capsaicin for urinary or prostate symptoms.	Insufficient

The evidence labels in the table describe human research on each ingredient, not on Protoflow. No study we found tested this combination.

Protoflow Side Effects and Who Should Skip It

We found no study of Protoflow itself, so its side effects as a formula are unknown. Here is what the research says about some of its ingredients:

• Blood thinners: the label lists 120 mg of ginkgo leaf, which the sales page doesn’t mention. A review of herb-drug interactions lists bleeding with warfarin and ginkgo as a plausible interaction ^[6], and in a large Veterans Administration record study, people taking ginkgo with warfarin had more bleeding events (hazard ratio 1.38) ^[7]. If you take warfarin or another blood thinner, talk to your doctor before taking Protoflow.
• Antidepressants: the same review lists mania in depressed patients who combined antidepressants with Panax ginseng ^[6]. The label says “Chinese Ginseng (Root)” without naming the species. Ask your doctor first.
• Diabetes medicines: in a meta-analysis of 16 trials in people with and without diabetes, ginseng modestly lowered fasting blood glucose compared with control ^[8]. Added to insulin or another blood sugar medicine, that could push glucose lower, so if you take one, talk to your doctor before taking Protoflow.
• Heart and blood pressure medicines: hawthorn was studied as an add-on for people with heart failure; reported side effects included nausea, dizziness and heart and stomach complaints ^[4], and one 6-month trial recorded more adverse events with hawthorn than with placebo ^[9]. If you take heart or blood pressure medication, check with your doctor.
• PSA tests: in a 3-month tribulus trial, average PSA rose from 1.4 to 1.7 and a liver enzyme rose slightly ^[10]. If you get PSA tests, tell your doctor you take a product with tribulus.
• Niacin: 75 mg per serving is 469% of the Daily Value, per the label. Oral niacin is linked to flushing, stomach upset, skin rash and liver problems, more often at higher doses ^[11]. If you have liver problems or already take niacin, ask your doctor.
• Vitamin E and prostate history: in the SELECT trial, healthy men given 400 IU a day of synthetic vitamin E were diagnosed with prostate cancer more often than men on placebo ^[12]. Protoflow’s 13 mg is a much smaller amount of a different form, but men with a prostate cancer history should ask their doctor about any vitamin E supplement.

Who should skip it: anyone pregnant or breastfeeding (it’s a men’s formula with no safety data for them), anyone under 18 (the label is written for adults), and anyone with new or worsening urinary symptoms who hasn’t seen a doctor yet, because those symptoms can have causes that need a diagnosis. The label itself says: “If you are currently taking any medication, consult with a physician prior to use.” For what it’s worth, saw palmetto on its own had about the same rate of adverse events as placebo in the Cochrane review ^[1].

For recent dietary supplement recalls and what each recall class means, see our FDA supplement recall tracker.

Protoflow Price, Packages and Money-Back Guarantee

Prices on the sales page’s order section, checked November 8, 2026: 2 bottles for $158 ($79 each), 3 bottles for $177 ($59 each) and 6 bottles for $294 ($49 each). Each bottle is a 30-day supply at two capsules a day, so the cost is $2.63, $1.97 or $1.63 a day. The 2-bottle pack adds a “Small Shipping Fee”, which the shipping policy puts at $9.95 for US orders (about $2.80 a day with shipping); the 3- and 6-bottle packs ship free in the US. International shipping is $19.95 to Canada, the UK, Ireland, Australia and New Zealand, per the shipping policy.

The 3- and 6-bottle packs include four e-books, which the sales page values at $97 each: Supercharge Your Body, Biohacking Secrets, 10 Ways To Turbocharge Your Testosterone and 1-Day Detox Guide. We didn’t read them. Each package also shows a “Savings” figure ($40, $284 and $434), but the page shows no regular price, so we couldn’t check what those figures are measured against.

The guarantee is 60 days. The refund policy counts it from delivery (“60 days after you receive the order”), while one line of the sales page FAQ says “2 full months after your purchase”; going by the earlier date is the safer reading. To get a refund you ship the bottles back to the Aurora, CO address at your own cost, then email support; refunds are “minus any shipping fees”, and items not in their original condition may get only a partial refund. The sales page calls it “No questions asked”, but its FAQ still requires the return. The sales page says it is a one-time payment with “no other future payments needed”.

See current Protoflow packages on the official website → (paid link)Official website · Checkout by ClickBank · 60-day refund (vendor terms apply)

Pros and Cons

Who Should (and Shouldn't) Consider Protoflow

Protoflow may suit men who have already talked to a doctor about urinary symptoms and want a fully labeled herbal blend they can show that doctor. The complete Supplement Facts panel makes that conversation easy, and the 60-day refund window gives some room to decide.

It’s a weaker fit if you want the saw palmetto amount used in trials (Protoflow has about a quarter of it), if you’d rather not take ginkgo, tribulus or niacin at 469% of the Daily Value, if you take blood thinners, antidepressants or heart medication and haven’t asked your doctor, or if you expect quick results: no trial backs the sales page’s “RECORD TIME” line. It also isn’t a substitute for a medical checkup.

Protoflow vs. Alternatives

If saw palmetto is the main reason you’re looking, check that any product you consider lists saw palmetto extract near the amount used in trials (320 mg a day in the trial we read ^[5]), and keep in mind that the Cochrane review found little to no difference from placebo in men with urinary symptoms from an enlarged prostate ^[1]. If your symptoms bother you, a doctor can go through options that have been tested in large trials and check for causes a supplement can’t address.

Protoflow’s difference is the mix: it adds ginseng, tribulus, Epimedium, damiana, muira puama and catuaba, herbs mostly marketed for male vitality, to a prostate formula. Whether that mix justifies its daily cost depends on how much you value those extras, since none of them has strong human evidence for the prostate.

Final Verdict: Is Protoflow Worth It?

Protoflow is more transparent than many launches we track: the full Supplement Facts panel is on the sales page, the payment is one-time, and there’s a 60-day refund window. The weak spots are the doses and the evidence. Saw palmetto, the herb most studied for urinary comfort, is at about a quarter of the trial amount, tribulus is at less than a sixth, and the most rigorous review of saw palmetto found little to no difference from placebo. Several ingredients have no human trials at all, and the label adds ginkgo, tribulus and niacin that the sales page doesn’t mention.

If you still want to try it, the 6-bottle pack is cheapest per day at $1.63, while the 2-bottle pack keeps less money at stake while you see whether it suits you. Either way, talk to your doctor first if you take any medication, and keep the return steps in mind.

Before you click: the official page is a long text sales letter (prices near the bottom) · smallest package: 2 bottles · checkout by ClickBank · no recurring charges, per the sales page · 60-day refund window.

Visit the official Protoflow website to compare packages → (paid link)Official website · Checkout by ClickBank · 60-day refund (vendor terms apply)

Protoflow FAQ

Does Protoflow have side effects?

We found no study of Protoflow itself, so its side effects as a formula are unknown. Its ingredients have known issues: niacin can cause flushing and stomach upset ^[11], ginkgo went with more bleeding events in people on warfarin ^[7], and hawthorn trials reported nausea and dizziness ^[4]. Talk to your doctor first if you take any medication.

Can I take Protoflow with blood thinners?

Ask your doctor first. The label lists 120 mg of ginkgo leaf, and in a large record study people taking ginkgo with warfarin had more bleeding events ^[7]. The sales page doesn’t mention ginkgo, so show your doctor the Supplement Facts panel, not just the sales page’s list of herbs.

How does the Protoflow money-back guarantee work?

You have 60 days from delivery, per the refund policy. Ship the bottles back to the Aurora, CO returns address at your own cost, then email support; the refund is minus shipping fees, and items not in their original condition may get a partial refund. You can also contact ClickBank support at clkbank.com about the order.

Is Protoflow a one-time payment or a subscription?

A one-time payment, according to the sales page, which says there are “no other future payments needed”. Checkout is handled by ClickBank. We didn’t buy, so we can’t see any extra offers that appear after payment; if some appear, you can decline them.

Is Protoflow sold on Amazon or Walmart?

We couldn’t check: Amazon and Walmart pages didn’t load for us on November 8, 2026. The vendor sells it on protoflow.net with ClickBank checkout, and its affiliate terms forbid promoting it on Amazon or eBay. Bottles from other sellers may not be covered by the vendor’s refund policy.

Who makes or sells Protoflow?

The label says it is distributed by PhytoThrive Labs, 19655 E 35th Dr #100, Aurora, CO 80011, and the privacy policy names Protoflow, Inc. ClickBank is the retailer that processes payments. We didn’t find who formulated it or where it is manufactured.

Does Protoflow really work?

Nobody has published a trial of Protoflow, so we can’t say. Its saw palmetto (84.5 mg) is about a quarter of the 320 mg used in a trial ^[5], and a Cochrane review found saw palmetto made little to no difference to urinary symptom scores versus placebo ^[1].

Has Consumer Reports reviewed Protoflow?

No. We searched consumerreports.org on November 8, 2026 and found no review or rating of Protoflow. For buyer feedback, see the complaints table above: on the same day we also found no Trustpilot reviews, no Reddit threads and no BBB profile for Protoflow or its distributor.

Sources

1. Franco JV et al. (2023). Serenoa repens for the treatment of lower urinary tract symptoms due to benign prostatic enlargement. The Cochrane database of systematic reviews. PubMed 37345871
2. Lee HW et al. (2021). Ginseng for erectile dysfunction. The Cochrane database of systematic reviews. PubMed 33871063
3. Santos CA Jr et al. (2014). Tribulus terrestris versus placebo in the treatment of erectile dysfunction: A prospective, randomized, double blind study. Actas urologicas espanolas. PubMed 24630840
4. Pittler MH et al. (2003). Hawthorn extract for treating chronic heart failure: meta-analysis of randomized trials. The American journal of medicine. PubMed 12798455
5. Kimura M et al. (2025). Beneficial effects of saw palmetto (Serenoa repens) fruit extract on the urinary symptoms of healthy Japanese adults with possible lower urinary tract symptoms: A randomized, double-blind, placebo-controlled study. Nutrition and health. PubMed 39042923
6. Fugh-Berman A et al. (2000). Herb-drug interactions. Lancet (London, England). PubMed 10675182
7. Stoddard GJ et al. (2015). Ginkgo and Warfarin Interaction in a Large Veterans Administration Population. AMIA … Annual Symposium proceedings. AMIA Symposium. PubMed 26958257
8. Shishtar E et al. (2014). The effect of ginseng (the genus panax) on glycemic control: a systematic review and meta-analysis of randomized controlled clinical trials. PloS one. PubMed 25265315
9. Zick SM et al. (2009). Hawthorn Extract Randomized Blinded Chronic Heart Failure (HERB CHF) trial. European journal of heart failure. PubMed 19789403
10. GamalEl Din SF et al. (2019). Tribulus terrestris versus placebo in the treatment of erectile dysfunction and lower urinary tract symptoms in patients with late-onset hypogonadism: A placebo-controlled study. Urologia. PubMed 30253697
11. Young SL et al. (2025). The adverse effects of oral niacin/nicotinamide – an overview of reviews. Eye (London, England). PubMed 40999226
12. Klein EA et al. (2011). Vitamin E and the risk of prostate cancer: the Selenium and Vitamin E Cancer Prevention Trial (SELECT). JAMA. PubMed 21990298
13. Oliveira CH et al. (2005). Clinical toxicology study of an herbal medicinal extract of Paullinia cupana, Trichilia catigua, Ptychopetalum olacoides and Zingiber officinale (Catuama) in healthy volunteers. Phytotherapy research : PTR. PubMed 15798997
14. Wong RH et al. (2012). Chronic effects of a wild green oat extract supplementation on cognitive performance in older adults: a randomised, double-blind, placebo-controlled, crossover trial. Nutrients. PubMed 22690320
15. Protoflow sales page (with the Supplement Facts image)
16. Protoflow refund policy
17. Protoflow shipping policy
18. Trustpilot profile for another domain using the name

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not medical advice. Talk to your doctor before starting any supplement, especially if you are pregnant, nursing, take medication, or have a medical condition.