Founder-led Mars Men describes their signature supplement as “The Most Potent & Natural Testosterone Stack,” and claims their supplement is “Clinically Dosed” to boost testosterone by 60% based on 8 natural ingredients such as Tongkat Ali, Shilajit, Zinc, Boron, Vitamin D, K1 and K2.
Health claims without proprietary extract used in clinical trials can be misleading and Mars Men made a bold promise to its users that its product increases testosterone naturally by 60%.
With 400,000 units sold and $27 million was raised in Series A, Mars Men recorded an impressive achievement in 18 months since the product launch in 2025. Not bad for a product that claimed to increase testosterone production “naturally” without conducting any form of clinical trials.
Due to nature of unregulated dietary supplement in the USA, the natural ingredients are sourced from non-standardized and non-clinically-tested extracts expose more concerns as to whether this natural testosterone formulation actually work.
There are at least 100 testosterone supplements on Amazon - commonly formulated using generic non-standardized Tongkat Ali, Shilajit, Zinc, Boron, Fenugreek, Horny Goat Weed and other herbs at high doses. Just like Mars Men or Testo Prime, most men fall for the scam of all-in-one testosterone supplement in recent years.
“The idea of combining testosterone-boosting herbs and vitamin to build your own optimal testosterone stack for men (due to the scare of rapidly declining testosterone in men) in one single capsule (or in few capsules) is not new” said David, a former GNC employee based in California.
We found that natural testosterone supplements like Mars Men were competing in the space of growing testosterone-boosting in early 2025 with other single-ingredient testosterone supplements that used standardized brand extract such as Physta® standardized hot water Tongkat Ali and KSM66® Ashwagandha. We found that TestoPrime was the best selling testosterone supplement, and here we are in 2026, Mars Men appears as the new kid on the block, to dethrone other supplements using aggressive health claims, paid reviewers on Amazon, and a series of too-good-to-be-true testimonials on its website.
“The easiest way to sell natural testosterone supplement is by selling the idea of 8-in-one “potent” testosterone supplement to consumers at the lowest cost” said former nutritionist who declined to be named.
The harsh reality that most buyers and users are concerned is, at $79 for 150 capsules, does this testosterone supplement formula work, is it safe or is it just another hype?
In this article we’ll investigate the risks based on formula and ingredients used in Mars Men natural testosterone supplement to give our take on whether or not it’s likely to be effective for optimizing T levels in men, and whether or not it’s safe for short-term or long-term use.
In addition, we will share our concerns with some of the clinical claims on Mars Men official website as part of technical review of the product.
The short answer is – it may not work on a larger population due to lack of human clinical trials and users are advised by Mars Men to “carefully assess their own claims before making a purchase”.
More importantly, Mars Men acknowledges “emerging concerns about the effectiveness” and the “absence of peer-reviewed research studies/ clinical trials” of their product, dosage and formulation – as per their statement on their official website. The lack of efficacy clinical tests drawn from their statement ultimately raises more doubt for users, lowering the probability that it may work to boost testosterone despite positioning it as a popular testosterone supplement brand in the US & Canada.
“Is Mars Men another white label product sourced from GHC India, sold in the USA with the same testosterone marketing hype that was once popularized by Dr. Huberman?” quipped a Reddit user, Tom Waltford after buying it from Amazon.
Many American users were shocked after the statement by Mars Men on the effectiveness (i.e efficacy) of its own signature product, raising whether it does actually work to raise testosterone within 45 to 90 days as advertised.
This aggressive health claim (and benefits) by Mars Men was similar to the review analysis of Solaray Tongkat Ali (another popular US-made natural testosterone supplement) that showed a negative testosterone drop by 40% after 4 weeks. Further investigation by an independent lab report revealed that Solaray 400mg Tongkat Ali supplement contains less than 0.001% of eurycomanone, a key biomarker responsible to increase testosterone production.
To assess if the formulation is “clinically-dosed” as per the claim by Mars Men, we conducted an independent safety-focused assessment by a team from Core Supplements LLC based in California on the per-serving formula shown on Mars Men supplement label.
Our methodology is based on evidence-based risk assessment based on commonly cited upper limits and known supplement cautions from other established research studies and journals.
Risk Safety Summary: Mars Men Testosterone Supplement
Results of ingredients used in Mars Men Testosterone supplement showed moderate-to-high risks to health exceeding the recommended and acceptable daily dosage limits.
| Ingredient | Label dose | Safety limit / reference point | Risk level | Key safety concerns / our findings |
| Vitamin D3 | 100 mcg / 4,000 IU | This equals the adult tolerable upper intake level; NIH notes vitamin D toxicity can cause high calcium, kidney issues, soft-tissue calcification, and heart rhythm problems in severe cases. (Office of Dietary Supplements) | Moderate–High | Already at the upper daily limit before counting food, multivitamins, or other D supplements. Risk rises if taken long-term without blood testing, especially with calcium supplements or kidney issues. |
| Vitamin K1 | 100 mcg | No established upper limit, but vitamin K can interfere with anticoagulant therapy such as warfarin. | Low for most / High if on blood thinners | Main issue is medication interaction, not dose toxicity. |
| Zinc citrate | 30 mg | Adult UL is commonly 40 mg/day; teens 14–18 have a lower UL of 34 mg/day, and younger teens lower still. NIH notes recommended intakes are much lower than this dose. (Office of Dietary Supplements) | Moderate–High | 30 mg is high for daily use. Long-term use may contribute to nausea, copper deficiency, immune changes, and HDL/cholesterol effects, especially if diet or other supplements add more zinc. |
| Tongkat Ali root extract | 1,000 mg | No universal safe upper limit; EFSA concluded high dose of Tongkat Ali root extract had potential genotoxicity concern in its novel food safety assessment. (EFSA Online Library) | High unless standardized and tested | 1,000 mg is a large amount unless the extract ratio and standardization are clear. Safety depends heavily on extract type, solvent, contaminants, adulterants, and HPLC/COA testing. Avoid in pregnancy, hormone-sensitive conditions, liver/kidney disease, or with complex medications unless supervised. |
| Fenugreek seed extract | 1,000 mg | No standard UL. NIH/NCCIH says larger-than-food doses may cause nausea/diarrhea, harmful blood-sugar drops, and reported liver toxicity; it is not safe in pregnancy above food amounts. (NCCIH) | Moderate–High | May lower blood sugar and may interact with diabetes medication. Possible bleeding-risk concerns with anticoagulants. Not suitable during pregnancy. |
| L-Taurine | 675 mg | EFSA reported a taurine NOAEL of 1,000 mg/kg body weight/day in safety review context; another EFSA assessment estimated 6 g/day as an observed safe human level. (European Food Safety Authority) | Low | Dose is modest compared with commonly studied intakes. Caution if combined with high-caffeine energy products, heart/kidney conditions, or multiple sports supplements. |
| Shilajit mineral extract | 400 mg | No universal UL. Health Canada requires shilajit to be purified and to meet heavy-metal specifications. (webprod.hc-sc.gc.ca) | Moderate–High | Main risk is contamination with heavy metals or poor purification. Should require third-party testing for lead, arsenic, mercury, cadmium, microbial contaminants, and adulterants. Avoid raw/unpurified shilajit. |
| Boron citrate | 4 mg | Adult UL is 20 mg/day; teens 14–18 UL is 17 mg/day. (Office of Dietary Supplements) | Low–Moderate | 4 mg is below adult and teen ULs, but avoid stacking with other boron products. Caution with kidney disease or hormone-sensitive conditions. |
| Vitamin K2 MK-7 | 100 mcg | No established Upper Limit, but same vitamin K interaction issue applies. | Low for most / High if on blood thinners | Combined vitamin K1 + K2 = 200 mcg total vitamin K activity. Not inherently excessive, but important if taking warfarin or similar anticoagulants. |
Ingredient risk assessment
Our observation is that Mars Men is a high-potency men’s hormone/testosterone-style formula combining polyherbal and other vitamins, thus this is not a simple daily multivitamin or supplement that can be taken by any aging men, athletes or active young adults without checking the baseline health status from his/her bloodwork or other symptoms related low testosterone.
The biggest safety flags for users taking Mars Men are the high dose of its individual ingredients used in the testosterone formula. Additionally, users who are unaware of their current health condition, baseline bloodwork or for young adults below 35, and aging men above 40, should seek professional advice from doctors when taking Mars Men as a daily supplement for long-term testosterone gains.
| Main concern | Why it matters to consumers |
| Vitamin D is already at 4,000 IU | This is the upper daily limit for most adults. Daily long-term use should ideally be guided by 25(OH)D blood testing and not at high dose of Vitamin D. |
| Zinc is high at 30 mg | Close to the adult’s daily Upper Limit (UL) and very close to the 14–18 teen UL of 34 mg/day. Long-term use without copper balance can be problematic to healthy adults and not recommended at high daily dosage. |
| Tongkat Ali at 1,000 mg | Safety depends on whether it is a standardized water extract, extract ratio, contaminants, adulterants, and batch COA. “1,000 mg” alone is not enough information. |
| Fenugreek at 1,000 mg | May affect blood sugar, digestion, liver tolerance, pregnancy safety, and medication interactions. |
| Shilajit at 400 mg | Shilajit used in Mars Men is not standardized and may contain low fulvic acid and high levels of dibenzo-alpha-pyrones (DBPs). At 400mg, it requires strong proof of purification and heavy-metal testing. This ingredient is quality-sensitive. |
| Stacking effect | The formula combines several endocrine/metabolic ingredients together, which increases uncertainty compared with taking one ingredient at a time. |
Our observations
For healthy adults below 45, one serving of Mars Men supplement may be tolerable short-term, but we would classify this as a high risk everyday supplement because the formula combines upper-limit dose of vitamin D (4,000 IU), high zinc content (30mg), unstandardized Tongkat Ali (1,000mg), 1,000 mg fenugreek, and Shilajit (400mg).
Mars Men all-in-one testosterone-boosting formula may not be suitable to those who has no deficiencies in Vitamin D, Zinc, or other nutrients. Therefore, conducting a blood test is deemed necessary by health experts before taking a high-dose of vitamins and herbs (combined into a single formula such as the one found in Mars Men) to ensure unwanted chemical or negative reactions to your body, especially if you have aging symptoms related to kidneys or liver.
80% of athletes have not used or will never use Mars Men testosterone supplement due to lack of clinically validated tests and certifications by Informed Sports
We found that Mars Men products have not been tested for batch-specific COA reports by independent labs (eg: SGS, EUROFINS) to show the content of its heavy metals, microbial testing, adulterant screening, and standardized extract biomarkers – notably for Tongkat Ali and Shilajit extract. Effectively, health experts and nutritionists believe the lack of 3rd party tests and certifications by NSF or Informed Sports have positioned Mars Men a relative high risk testosterone supplement for recreational and professional athletes.
Our analysis from trusted sources on TrustPilot, Amazon and Reddit revealed that more than 50% of users felt sick, nausea, stomach discomfort and digestion issues after taking Mars Men supplement, indicating quality issues on its ingredients, sourcing and negative reactions from combining Tongkat Ali, Shilajit, Fenugreek, Zinc and Boron at high doses above acceptable daily dose limits.
At the same time, paid verified reviewers on Amazon showed that Mars Men helped to them to gain more energy for their workouts, and that trend appears consistent across all paid reviewers and affliates on Amazon.
At the same time, genuine and organic feedback from customers after taking Mars Men Testosterone Supplement after 30, 60, 90 and 360 days showed a contrasting and opposing views, with many sharing their negative experiences
We found growing evidence between Jan 2026 to April 2026 that Mars Men did not work on the consumers despite glowing reviews in the first 12 months since it was launched on Amazon in 2025. This remains one of the major concerns that laboratory tests of users showing no improvements in both total and free testosterone levels after taking it for 60 days, which was a direct opposite of the claimed improvements in testosterone by Mars Men.
“Where are my ‘90 days guarantee’? Did absolutely nothing. Actually I tested my blood work after 2 months taking the pills and my testosterone was 20% lower. Fake product. Tons of hype. Does nothing.” Said a verified user who bought Mars Men on Trustpilot.
The credibility of Mars Men as a potent effective testosterone supplement is at stake, with high probability of it not working for most men as reported by consumers on TrustPilot and Amazon.
Another user on Trust Pilot complained that he took Mars Men supplement for 4 months in hopes to improve his natural testosterone. Instead, he said that “I have had low test for several years and started taking this but the product did not help with any of my symptoms. I recently had my testosterone checked and my levels were at 68 so it didn’t boost my test at all.”
One verified reviewer (Kenneth Smith) wrote: “Tested in August with a 234 T level. Started using Mars Men… Canceled after I retested last month and it dropped to 156 after taking it for 4 months. Don’t waste your money.”
And Keith Sage, who gave Mars Men a full year assessment said “I used this product for 1 full year to give it a fair chance to provide the advertised experience. In that time, year over year my T-levels actually dropped 47 points. I requested a refund on the last order and was denied.”
We discovered that Mars Men supplement uses generic non-standardized Tongkat Ali extract in its formulation that gave inconsistent results and improvements in testosterone compared to superior standardized US-patented Tongkat Ali extract Physta® or LJ100®.
For long term use, customers continued to report null effects after using Mars Men supplement for more than 90 days, with some verified users reporting reduction in testosterone levels after 12 months of regular use.
“Spent money on a product that had high reviews on your website came to reviews on here and not so good. Took pills for a solid month!! I understand it says 90 days but I’ve noticed zero change, zero energy increase, zero anything.” said Matt from United States, a verified user on TrustPilot.
Another user David Goodsell shared similar experience. “I’ve been taking Mars Men supplement for several months now and honestly, do not see any change or improvement to my energy level, focus or stamina. I believe that I gave it a fair shake but realistically I don’t see the benefits” he said.
Testosterone stack supplement like Mars Men is solely based on marketing, less on developing proprietary extract or conducting clinical studies or research. Their recent capital raising of $27 million is meaningless if money is spent on marketing to grow the business on an untested formulation and ingredients.
In a series of complaints in Q1 2026, customers continue to report zero effects after taking Mars Men supplements. “In the 3 months that I have been on it, I don’t feel anything.” said Dorian Holland on TrustPilot. Meanwhile another verified user Daniel S said he did not “feel any change.” after his purchase in January 2026.
In short, customers were disappointed and felt short changed after buying Mars Men, expecting a huge boost in their testosterone production after bloodwork. “The product didn’t work as expected.” Said Christopher Knapp, a verified Trustpilot user in his recent review.
Customer Feedback: Nausea & Feeling Ill
Nausea and feeling ill are common by users who took Mars Men testosterone supplement, potentially due to the wrong mix of vitamins and herbs – especially at high doses.
Customer known as MY T6 gave a 1 star on Trust Pilot recently on April 2026. The buyers from United Kingdom reported that Mars Men “made me feel sick and not right after a week of use”. He claimed that this was after he took the supplement daily just after breakfast. As he was frustrated with the product’s effectiveness, he warned others on the refund issue. “Please be aware when ordering in the UK you cannot get a refund and this is a subscription based recurring charge” he added.
Another verified anonymous user on Trustpilot said that Mars Men made him “feel sick or the smell of it” until he was forced to stop taking it – giving it one star review.
Meanwhile, a customer known as RT from Australia gave similar 1 star review in 2026. “Signed up to buy 1 packet of tablets to try — had no real effect, just a sore stomach, and somehow ended up on a subscription getting charged $125 AUD every month” said the user without disclosing much details.
Stomach Discomfort & Digestive Issues
Consuming high concentration (or marketed as “potent”) of polyherbal formulation and vitamins in a single take may cause stomach discomfort and digestive issues. We found similar pattern on those taking Mars Men supplement since the formulation is not clinically tested on humans.
Anonymous verified reviewers aggregated from Health Insiders / third-party review compilation showed similar trend. One user on HealthInsiders reported that he took Mars Men faithfully for a month, but saw no improvements in energy or stamina. “I just ended up with stomach discomfort and disappointment. Waste of money.” he said on HealthInsiders
Taking into consideration the ingredients, risks assessment and customer reviews, we found that Mars Men is a popular brand that works hard to give customer the assurance that its formulation works as a natural testosterone booster. However, issues such as testosterone declines from actual users, lack of clinically-backed proprietary extract, the use of unstandardized Tongkat Ali extract and other herbs, the rising cases of adverse side effects from users, the absence of label accuracy and 3rd-party verified COA reports, unauthorized auto-subscription enrollment and excessive high doses of ingredients may pose higher risks as reported by illuminate labs review.
| Risk Area | Severity | Implication |
| Unauthorized subscription enrollment | CRITICAL | Potential FTC/ACCC consumer protection violation; class action exposure; chargeback campaigns that could result in merchant account termination. |
| Lab-confirmed T-level declines in users | HIGH | Directly contradicts core efficacy claim; constitutes potential false advertising under FTC guidelines; medical liability exposure. |
| Absence of label accuracy COA | HIGH | Unable to verify that labeled ingredient doses are actually present; undermines ‘clinically dosed’ claim; regulatory risk if FDA audits. |
| Deceptive marketing graphics (uncited) | HIGH | Biologically implausible age-vs-testosterone graphic without citation; TRT comparison violates standard for scientific claims in supplement advertising. |
| Cancellation inaccessibility | HIGH | Breach of consumer rights in multiple jurisdictions (US, AU); CFPB complaint risk; PayPal/card network dispute escalations. |
| AI-only customer service with no escalation | MEDIUM | Perceived abandonment post-purchase; amplifies all other complaints; prevents resolution and drives review escalation. |
| Shipping delays eroding trial period | MEDIUM | 3-week shipping on a 30-day trial product makes the guarantee structurally difficult to claim; can be framed as intentional. |
| Supra-clinical ingredient dosing | MEDIUM | Vitamin D3 at 40% of toxicity threshold and underdocumented Tongkat Ali doses create liability if adverse health events accumulate. |
| Review authenticity questions | LOW-MED | Pattern of similarly-worded 5-star reviews (short, focused on ‘steady energy’ and ‘recovery’) may attract Trustpilot algorithm scrutiny. |
Ingredient & Clinical Evidence Conclusions
COA & Lab Testing Conclusions
Customer Sentiment Conclusions
Recommendations for Prospective Buyers
Our independent team at Debate LLC, Core Supplements LLC and research team from Biotropics together with reports published by Illuminate Labs concluded that the Mars Men Supplement contains unstandardized extract, lack of COA transparency to reaffirm its bioavailability, lack of clinical-backed extract and the “clinically-dosed” claim of each ingredient was found to be far above the safety upper limits. This presents a higher risks that may cause multiple adverse side effects reported by consumers who purchased the product.
Additionally, our literature reviews and findings present long-term risks for buyers – with higher health risks on liver complications, kidneys issues, gut issues and hormonal balance – particularly those who have not undergone blood test or those who have pre-existing medical conditions. Therefore, users are warned against buying untested polyherbal natural testosterone supplement that are not clinical tested or exceptionally high doses.
We also concluded that the 25% one-star review on TrustPilot were found to be disproportionately high relative to the overall score (of 3.6 stars out of 5 stars), indicating a systemic issue beyond product dissatisfaction, side effects as most users felt “cheated that the product did not work to improve their health”.
In addition, the marketing claims of improved testosterone were not conclusive and the actual extracts used in Mars Men supplements were not standardized, used, tested or backed by human clinical trials or research studies conducted by Mars Men or third party labs. No evidence was found to suggest that Mars Men testosterone polyherbal formulation (i.e Tongkat Ali, Shilajit, Zinc, Boron, Fenugreek Seed extract, L-Taurine, Vitamin D, K, K2) actually worked to boost testosterone the real world apart from consumer claims found on Reddit, Amazon and TrustPilot.
Aligning to other reports and verified genuine customer reviews, our final verdict is – we do not recommend users buying Mars Men if you are concerned on long term safety and health.
Alex Kua leads AKARALI’s Global Partnership Community to help athletes, sports communities, and thousand of others optimize their well-being through evidence-based research that enables them to make better informed decisions. His legal and business consulting background underpins the rigorous data-driven approach in his writing – from hours of interviews, real-world performance data, and firsthand experiences of real people – offering actionable insights that connects clinical research, emerging health trends, and real-world applications. He is also an experienced researcher in herbal nutrition, with years of deep technical knowledge on Tongkat Ali (Eurycoma longifolia), including quality standards, industry benchmarks, lab tests, clinical trials, and the use of natural herbs by collaborating with top scientists, herbal experts, and nutritionists. As part of the core team behind AKARALI’s knowledge portal, he empowers people worldwide to access the benefits of high-quality herbal nutrition in a way that is effective, sustainable, and safe. He is also an avid runner, with regular participation in local sports communities and running events.
Our articles are third party reviewed by our panel of experts and medical advisors to ensure the facts are accurate and credible. These are validated against multiple source references which include but not limited to research studies, peer-reviewed journals, pre-clinical studies, clinical tests and other credible publications.
Our panel of medical advisors and experts are highly experienced in their individual fields. However, they do not provide any medical advice or recommendations arising from content published in this article.
Disclaimer:
The content published on this website is for educational purposes and should not be viewed, read, or seen as a prescription or constitute any form of medical advice. We recommend you consult your nearest GP or doctors before consuming Tongkat Ali or any products which contain Tongkat Ali. For further information, kindly refer to our Frequently Asked Questions (FAQ) for more information.
