Review · Men's vitality

EndoPeak review: a familiar label at a higher price

EndoPeak is a capsule supplement sold for men's sexual wellness. When we read its Supplement Facts panel, we recognized it: the nine ingredients and every dose match ErecPrime, a product distributed from the same Colorado address. Here is what that formula can be expected to do, and why this version costs more.

By Grant Whitaker, Editor · Updated October 23, 2026 · 20 studies checked on PubMed

What EndoPeak is, and who sells it

The bottle label names Endo Peak of 19655 E 35th Dr, Aurora, Colorado as the distributor, and the website footer uses the name EndoPeak Research. Digistore24 acts as the retailer. Each bottle holds 60 capsules, two per day, so one bottle lasts a month. The product is sold only through its official website, in 1, 3 and 6-bottle packages, each as a one-time charge.

The ErecPrime label carries the same Aurora address, and the two Supplement Facts panels list the same nine ingredients in the same amounts, down to the 33.3 mg entries and the inactive ingredients. Both products are sold through the same Digistore24 vendor account. We cannot see inside either factory, so we cannot say the capsules are identical, only that the printed formulas are. Our ErecPrime review covers that formula too; this page focuses on what is specific to EndoPeak.

The label, in words

The seller's affiliate terms allow only the images in its resource folder, and that folder holds banners and a pack shot but no label. So rather than reproduce the label, here is what it says per two-capsule serving: magnesium (as oxide) 133.3 mg, which is 32% of the daily value; zinc (as oxide) 20 mg, which is 182% of the daily value; tribulus fruit 500 mg; chrysin from Oroxylum indicum seed 50 mg; and 33.3 mg each of epimedium aerial parts, tongkat ali root, saw palmetto berries, Chinese hawthorn berry and winged treebine (Cissus quadrangularis) stem. Other ingredients are a cellulose capsule, rice flour and magnesium stearate.

The formula next to the research

For each ingredient we looked for human trials on sexual wellness in men and compared the amount studied with a daily serving of EndoPeak.

Tribulus: real but uneven evidence

Tribulus carries most of the formula's weight. In the largest trial we found, 180 men aged 18 to 65 with mild or moderate erection difficulties took a standardized extract or placebo for 12 weeks. Scores on the International Index of Erectile Function, a standard questionnaire, improved 2.7 points more with tribulus, and desire and satisfaction scores moved the same way ^[3]. A three-month study of 70 older men with low testosterone and urinary symptoms reported higher questionnaire scores and testosterone in the tribulus group, along with small rises in a liver enzyme and in PSA, the prostate blood test ^[4]. A 2026 meta-analysis of eight trials found tribulus ahead of placebo on erectile function scores with no difference in testosterone ^[6].

A 30-day trial in men over 40 using 800 mg a day found no difference from placebo ^[5], and a separate 2026 meta-analysis of 14 herbal trials judged the tribulus evidence insufficient, while finding stronger signals for saffron and ginseng, neither of which is in EndoPeak ^[7]. The positive trial also used an extract concentrated 35 to 45 times. EndoPeak lists plain "tribulus (fruit)" with no ratio or saponin content, so 500 mg on this label may represent far less active material.

Tongkat ali: studied, but present as a trace

In 109 men aged 30 to 55, 300 mg a day of a tongkat ali water extract for 12 weeks raised erectile function and libido scores compared with placebo ^[8]. A six-month trial in 45 men with symptoms of low androgen levels used 200 mg a day, and the best results came when the herb was combined with exercise training three times a week ^[9]. A meta-analysis of two trials found no overall difference from placebo, with a benefit only in men who started with lower scores ^[10]. EndoPeak supplies 33.3 mg, a small fraction of any studied amount.

The "testosterone" ingredients

The sales page presents saw palmetto as a testosterone production aid and magnesium as support for testosterone levels. A 2024 systematic review of 52 studies on products sold as testosterone boosters found that most ingredients failed to raise total testosterone; tongkat ali was rated possibly effective in some groups, while tribulus, zinc and magnesium were not among those rated effective ^[11]. Zinc appears to matter mostly for men who are short on it: in a small study, older men with marginal zinc deficiency saw testosterone rise after months of supplements ^[15]. Chrysin, sold on the idea that it slows conversion of testosterone to estrogen, produced no change in urinary testosterone in men over 21 days ^[13]. We found no human study showing saw palmetto raises testosterone, and a 2023 Cochrane review of 27 trials found it gives little to no benefit even for urinary symptoms, its main research use ^[14].

Epimedium, hawthorn and Cissus

Epimedium contains icariin, which blocked an enzyme involved in blood vessel relaxation in a test tube experiment with purified compounds ^[12]. That says little about 33.3 mg of dried herb in a person, and the label gives no icariin content. Hawthorn's clinical research uses leaf and flower extract in people with heart failure ^[16]; EndoPeak uses the berry, and we found no trial of it for circulation in sexual wellness. We found no trial of Cissus quadrangularis on stamina or sexual wellness in men.

What the marketing claims vs. what we could verify

The headline. The video page opens with a promise of firm erections within seconds from what it calls a muscle trick. We found no published study of EndoPeak or of any ingredient in it showing an effect measured in seconds. Every positive ingredient trial above ran for weeks or months. There is real research on muscles and erectile function, but it involves exercise: in a randomized trial of 55 men, three months of pelvic floor exercises with biofeedback improved erectile function scores compared with lifestyle advice alone ^[17]. A capsule does not train a muscle, so that research does not support the product.

The inflammation story. The FAQ says lasting results arrive once inflammation in the reproductive system is completely eliminated after about three months. We found no study showing that this formula, or any of its ingredients at these doses, does that. No published trial tests EndoPeak itself, which matches a 2021 review that found no popular men's sexual wellness supplement with whole-product randomized trial evidence ^[20].

The reference list. The sales page cites nine papers. We opened them. Most concern vitamin D, niacin, folate, DHEA, stem cells or blood pressure, none of which relates to an EndoPeak ingredient. Three touch on its ingredients: the epimedium test tube study above ^[12], a 2018 herbal review whose most encouraging findings were for ginseng, which EndoPeak does not contain ^[18], and a urologist's guide that rated the evidence for common men's sexual health supplement ingredients as generally of low quality ^[19]. None of them tests the product.

The claim to be unique. The page calls EndoPeak the only natural supplement on the market designed for its purpose. A second product with the same printed formula, from the same address and vendor account, makes that hard to accept.

Inconsistencies on the seller's own pages

• The ingredient section on the sales page lists eight ingredients and leaves out zinc, which the label shows at 182% of the daily value.
• We found three sets of directions: the label says two capsules before bedtime, the sales page FAQ says after your first meal, and the FAQ on the contact page says first thing in the morning on an empty stomach.
• That contact page FAQ also describes the product as hearing support for men and women, which looks like text carried over from another product.
• The return policy mentions a different web address and says sale items cannot be refunded, while every package is presented as a discount from a higher list price.

None of this changes the capsules, but it makes us less willing to take the remaining claims at face value.

Price, packages and refund policy

Prices on the official site when we checked:

• 6 bottles: $49 each ($294 total), free US shipping, two digital e-books included. About $1.63 a day.
• 3 bottles: $69 each ($207 total), free US shipping, two digital e-books included.
• 1 bottle: $79, plus shipping shown at checkout.

On the same day, ErecPrime's site listed its single bottle at $69 and its three-bottle package at $177. For the same printed formula, EndoPeak costs $10 more for one bottle and $30 more for three; the 6-bottle price is the same. The page also says most buyers choose six bottles and urges stocking up while supplies last; we could not verify either statement.

The seller offers 60 days to request a refund. Under its return policy you must get a return authorization by email within that window, ship the product back at your own cost within 14 days of receiving that authorization, and accept that some refunds may be partial. Since the tribulus and tongkat ali trials ran 12 weeks to six months, a fair personal test runs past the refund window. If you buy, read the return policy first and note the 60-day date.

Safety

In the placebo-controlled trials above, tribulus and tongkat ali caused side effects at rates similar to placebo ^{[3] [6] [8]}. One tribulus study did record small rises in a liver enzyme and in PSA over three months ^[4], so men having their PSA monitored should mention any tribulus product to their doctor. Hawthorn is studied as a heart herb ^[16], and anyone on heart or blood pressure medication should ask before adding it. The 20 mg of zinc is well above the daily value, which matters if you already take a multivitamin with zinc.

Talk to your doctor before starting EndoPeak if you take any prescription medication, have heart, blood pressure, liver or kidney concerns, or have been told to avoid hormone-related supplements. New or worsening changes in sexual function, chest pain, or shortness of breath with effort deserve prompt medical care. Results vary from person to person.

What we liked and what gave us pause

Frequently asked questions

Is EndoPeak the same as ErecPrime?

Their printed Supplement Facts panels are identical, and both labels list the same distributor address in Aurora, Colorado. If the label is what you are paying for, compare prices before you choose.

How long before I notice anything?

Results vary. The ingredient trials that found benefits lasted 12 weeks to six months, so we would not expect a change in seconds or days. Keep the 60-day refund window in mind.

Where can I buy it?

Only on the official EndoPeak website. The seller does not allow sales on Amazon, eBay or other retail sites, so listings there may not be genuine or covered by the refund policy.

Does EndoPeak replace a visit to my doctor?

No. It is a dietary supplement. Because erection problems can signal heart or blood vessel issues, a checkup is the right first step, and you should not stop or change a prescription without talking to your doctor.

How we reviewed EndoPeak

We read the official sales, video, contact, return, shipping and affiliate pages, and the Supplement Facts label published on the site. We compared the label line by line with the ErecPrime label, searched PubMed for human trials of each ingredient on sexual wellness in men, and opened every paper we cite, including the ones the sales page lists. We did not test the product on people, and nobody at Stark Verve is a medical professional. Read our editorial policy to learn how we choose and update reviews. Stark Verve earns a commission if you buy through our links; that never changes what we write about the evidence.