Himmense BOOST vs Mars Men: Which Testosterone Support Formula Is Right for You? (2026 UK Comparison)

Mars Men has quietly become one of the most heavily advertised testosterone brands in the UK. Instagram, YouTube, TikTok — if you're a UK man in your 30s, 40s or 50s, you've almost certainly seen the pitch. Rugged founder shots, "test went from 198 to 687 in 8 weeks" testimonials, and a $39 starter kit that looks like a bargain.

But the closer you look at Mars Men through a UK lens, the more the picture changes. The formula only has six ingredients. One of them — Tongkat Ali — sits in a grey area for UK sale. The pricing is USD, the shipping is transatlantic, and the customer sentiment on independent platforms doesn't match what you see on the brand's own site.

This review is written for UK men who have seen the ads and are trying to work out whether Mars Men is actually a good testosterone supplement to buy — and where it sits versus a UK-native alternative like Himmense BOOST, which we make. We've stuck to public information, published Trustpilot data, and the ingredients printed on both products' labels. You can verify every claim in this piece.

Quick verdict for people scrolling

Mars Men is a competently marketed testosterone supplement built on a short, generic formula. It contains six actives: Tongkat Ali, Fenugreek, Shilajit, Boron, Zinc and Vitamin D. None of the six are branded, standardised extracts. Tongkat Ali is not authorised for sale as a food supplement in the UK, which puts UK buyers in an awkward position. The price is $39 USD at introductory rate (typical retail $118), before currency conversion, international shipping and potential import handling fees. Independent Trustpilot sits at 3.7 out of 5 based on 1,819 reviews, versus a 4.76 on-site rating — a gap worth noting.

Himmense BOOST is a UK-made testosterone supplement with 19 active ingredients including six clinically standardised, branded extracts (PrimaVie® Shilajit, Testofen® Fenugreek, KSM-66® Ashwagandha, Tesnor®, ForsLean® Coleus Forskohlii, BioPerine®), at £31.49 monthly with free UK subscription delivery. It deliberately does not contain Tongkat Ali (compliance) or Boron (limited human evidence).

If you're a UK buyer looking for a testosterone formula that's legal to sell here, uses branded and standardised extracts at clinically studied doses, ships from the UK, and is priced in pounds — the comparison is straightforward. Read on for the detail.

Who is Mars Men?

Mars Men is a US direct-to-consumer supplement brand based in Austin, Texas (registered at 1401 Lavaca St). It sells one flagship SKU: "Natural Testosterone Support", positioned as a daily capsule for men who want to raise energy, sleep, drive and body composition.

The brand markets itself heavily on Instagram, TikTok, YouTube and X, using a mix of paid influencer content, doctor-review videos and user testimonials. The website carries strong social-proof claims: "3M+ bottles sold", "500K+ customers", and a 4.76 out of 5 rating from 4,929 on-site reviews.

Distribution is DTC-only. Mars Men do not sell via Amazon, eBay or Boots. Every purchase goes through their own website, which lets them control pricing, subscription enrollment and reviews. It also means UK buyers are entering a US-based checkout flow with USD pricing and international shipping.

The Mars Men formula: six ingredients, no branded extracts

Mars Men's published testosterone-support formula contains six actives. Based on their product pages, third-party retailer listings (GNC, eBay UK), and the ingredient panel photographs available online, the approximate daily doses are:

Six ingredients is a defensible formula design — the argument being that fewer actives at higher doses beats a "shotgun" of tiny amounts. It's the same logic bodybuilder-style testosterone formulations have used for years.

The problem for a UK buyer isn't the count. It's the choices.

The Tongkat Ali problem

Tongkat Ali (also called Eurycoma longifolia or Longjack) is a herbal extract from a Southeast Asian tree, historically used for male vitality. In the US, it's sold widely as a testosterone supplement.

In the UK and EU, its regulatory status is very different. Tongkat Ali is not authorised as a Traditional Herbal Medicinal Product under the UK's Traditional Herbal Registration scheme. It is not on the EU Novel Foods approved list. Legally selling it as a food supplement to UK consumers is not straightforward, and reputable UK manufacturers generally avoid it for that reason.

What this means in practice: Mars Men shipping Tongkat Ali capsules to a UK address is operating in a grey zone. It doesn't make the product dangerous — Tongkat Ali is broadly considered safe in typical doses — but it does mean a UK buyer is receiving an ingredient their local regulator has not approved for sale.

That's why Himmense BOOST, which is UK-made and sold from a UK company, deliberately does not include Tongkat Ali. Not because Tongkat Ali is a bad ingredient — some of the research is encouraging — but because we can't legally sell it here.

The Boron question

Boron is a trace mineral that appears in many testosterone-booster formulas because of one small 2011 study (Naghii et al.) suggesting acute effects on free testosterone after a week of 10mg daily dosing. Since then, the picture has stayed murky. There isn't a convincing body of larger trials showing sustained testosterone benefits at 4mg (Mars Men's dose) in healthy men.

Boron is not dangerous at these doses. It just isn't a strong bet. Himmense BOOST omits it and reallocates that formulation space to actives with stronger human evidence — chief among them Testofen® Fenugreek and KSM-66® Ashwagandha, both of which have multiple published randomised controlled trials at the doses used in BOOST.

The dose-transparency check

The other detail worth flagging: Mars Men's published ingredients are generic. Fenugreek, not Testofen® Fenugreek. Shilajit, not PrimaVie® Shilajit. That matters because testosterone ingredient research is typically done on specific standardised extracts, not the raw herb.

Testofen®, for example, is a specific fenugreek extract standardised for a saponin complex called Fenuside™, and its human clinical trials (including a 2016 trial in Aging Male) used that exact material at 600mg. Generic fenugreek can be a very different product with different actives. There's more on the specific evidence base for fenugreek and testosterone in our Can Fenugreek Boost Testosterone? deep-dive.

The same applies to PrimaVie® Shilajit — a specific purified extract standardised to at least 50% fulvic acid, used in the published human trials on testosterone. Generic shilajit varies enormously in purity, mineral profile and heavy-metal load.

When a formula lists generic ingredients, you're paying for the herb. When a formula lists branded, standardised extracts, you're paying for the herb plus the specific material the research was actually done on. The two aren't the same product.

Price: what you actually pay from a UK address

Mars Men's headline price is easy to misread. The current promotion advertises $39 for a 30-day starter kit, described on their site as 67% off a $118 regular price. That's the launch or promotional price and, if you don't subscribe, subsequent bottles revert closer to the standard rate.

For UK buyers, the total cost is not $39. You need to add:

• Currency conversion. $39 at typical USD/GBP rates in 2026 works out to roughly £30-£32, depending on the day and whether your card charges a foreign-transaction fee (most UK debit and credit cards do — commonly 2.75% to 3%).
• International shipping and handling. Free shipping from Austin, TX to a UK address is unusual. Where free international shipping is offered, delivery is typically slow (10-21 days by economy airmail).
• VAT and customs handling. Since Brexit, low-value personal imports of dietary supplements from the US may attract VAT at 20% plus a Royal Mail or courier handling fee (typically £8-£12), depending on how the parcel is declared. This is unpredictable but real.
• Subscription renewal. If the discount only applies to the first bottle, subsequent shipments may bill closer to the standard rate — worth checking terms carefully at checkout.

A UK buyer's realistic month-two cost, once the intro discount ends and any duty/handling has been billed, can land materially above the advertised $39.

Himmense BOOST is £31.49 for a one-month supply, with free UK subscription delivery, no currency conversion, no import duty and no VAT surprise. That's a clean, single-line-item cost that stays consistent month on month.

The reviews gap

Mars Men's on-site product page shows a 4.76 out of 5 rating from 4,929 reviews. On independent Trustpilot, the same brand sits at 3.7 out of 5 from 1,819 reviews. That's a meaningful difference.

To be fair to Mars Men, gaps between on-site and third-party ratings are common in DTC. On-site review software can moderate, filter or delay negative reviews in ways Trustpilot cannot. But the size of the gap — nearly a full star — is at the wider end of what we typically see.

On Trustpilot, the recurring themes in negative reviews tend to cluster around:

• Effects being subtler than the marketing suggests, or absent entirely, particularly after the initial 4-8 week window
• Difficulty cancelling subscriptions or getting refunds
• Long shipping times to non-US addresses
• Customer-service response speed

On Reddit, there are widely discussed threads across supplement subreddits where users have posted before-and-after blood work showing no improvement or, in some cases, mild decreases in total or free testosterone over multi-month use. This is anecdotal, self-reported data — not clinical evidence — but it is publicly visible and it shapes the SERP for anyone Googling "Mars Men review".

None of this means Mars Men is a scam. Plenty of customers report benefits. But if you're relying on the on-site "4.76 out of 5 from 4,929 reviews", you're getting one side of the picture. The independent picture is more mixed.

Marketing style versus formulation transparency

Mars Men leans heavily on lifestyle marketing: rugged imagery, transformation stories, "from 198 to 687 in 8 weeks" testimonials, dramatic before/after arcs. The founder story is prominent; the ingredient story is secondary.

This is a deliberate choice. It works in-feed because it triggers emotion and identity. It works less well once a buyer with a bit of research instinct starts asking what's actually in the capsule and how much of each testosterone-support active they're getting.

Himmense BOOST takes the opposite bet. The full formula — every active, at every dose, with the branded extract name where relevant — is published on the product page. Nothing is a "proprietary blend". The doses match the doses used in the published clinical trials, not smaller marketing amounts.

Where the two testosterone formulas overlap

Mars Men and BOOST share four ingredients out of Mars Men's six. That's worth examining, because the "same ingredient" often turns out to be very different products.

Fenugreek

Both products contain fenugreek. Mars Men uses generic fenugreek at ~675mg. BOOST uses Testofen® fenugreek at 600mg — the specific standardised extract used in the 2016 Aging Male trial by Rao et al., which reported improvements in serum testosterone in ageing men. Testofen® is standardised for a proprietary saponin complex called Fenuside™. Generic fenugreek does not carry that standardisation and does not carry that trial data.

Shilajit

Both contain shilajit — but shilajit is a category of material, not a single ingredient. Purified, standardised shilajit like PrimaVie® Shilajit (used in BOOST at 300mg) is standardised to at least 50% fulvic acid and screened for heavy metals. Generic shilajit, particularly at higher doses like Mars Men's ~1000mg, can vary enormously in purity, potency and heavy-metal load. Bigger number, weaker material.

Zinc

Both include zinc, an essential mineral with an EU-authorised claim that it "contributes to normal testosterone levels in the blood". Mars Men uses ~30mg (200% NRV — near the safe upper limit for long-term daily supplementation). BOOST uses 15mg (150% NRV), which is closer to the daily need without approaching the tolerable upper intake. Both are legitimate choices; BOOST's is more conservative and safer for years of daily use.

Vitamin D

Both include vitamin D. Mars Men uses ~4000 IU. BOOST uses 1000 IU. The UK NHS recommendation is 400 IU daily during autumn and winter. 1000 IU is a common maintenance dose in supplements. 4000 IU is high — safe for most adults short-term, but a level that anyone already taking vitamin D or exposed to sunlight regularly should check with a GP before stacking. See our full breakdown in the Vitamin D3 for testosterone guide.

Where BOOST goes further

Beyond the four shared ingredients, BOOST includes 13 more active nutrients and botanicals that Mars Men doesn't. These aren't padding — every one is either a branded, standardised extract at a clinically studied dose or a well-established nutrient with an EU-authorised health claim.

Four more patented branded actives

Botanicals that support male vitality

BOOST also includes Ginger at 500mg, Panax Ginseng at 100mg, Maca Root at 100mg and Tribulus Terrestris at 50mg — botanicals with long traditions of use in male vitality and supporting bodies of preclinical and clinical work.

Nutrients that support testosterone pathways

The body cannot make testosterone without adequate raw materials. BOOST includes the nutrient scaffolding needed for testosterone synthesis and clearance:

• Magnesium — 110mg (29% NRV) — supports normal muscle function and energy metabolism
• Selenium — 8.25μg (15% NRV) — supports normal spermatogenesis
• Vitamin C — 12mg (15% NRV) — supports normal immune function
• Vitamin B6 — 1.3mg (93% NRV) — regulates hormonal activity
• Vitamin B12 — 2.5μg (100% NRV) — supports normal energy-yielding metabolism
• Folate (B9) — 200μg (100% NRV) — supports normal amino-acid synthesis
• Vitamin E — 1.8mg (15% NRV) — antioxidant support

One capsule a day, taken after food. That's the whole product.

Head-to-head: Mars Men vs Himmense BOOST

Who Mars Men might be right for

To be balanced about it — Mars Men is not a bad testosterone product for the right buyer. If you're a US buyer, you're in the brand's home market. Shipping is free, currency is native, and Tongkat Ali is legally sold as a supplement. The formula is streamlined and the price after the intro discount is competitive against other US DTC brands.

Where it stops making sense is when a UK buyer copy-pastes the US pitch into a UK context. The regulatory position on Tongkat Ali changes. The advertised price changes once you factor in currency, shipping and VAT. The delivery time changes. And the ingredient depth is thin compared with what a UK-made testosterone formulation can legally include.

Who BOOST is right for

BOOST is designed for UK men who want a testosterone-support formula that is:

• Legal to sell in the UK, made in the UK, shipped from the UK
• Built around branded, standardised extracts at clinical-trial doses
• Fully transparent — every active, every dose, no proprietary blends
• Simple to take — one capsule a day, after food
• Priced consistently in pounds, with no import surprises or currency drift

It is not for anyone who prefers a two-ingredient bodybuilder-style stack, or who wants a mega-dose of a single herbal like Tongkat Ali. Those buyers should look elsewhere. But for the UK man who wants a well-rounded formula built on the strongest available evidence at doses the research actually used, BOOST is engineered for exactly that.

Why we designed Himmense BOOST the way we did

Full disclosure: we make BOOST. This piece is written from a UK men's testosterone supplement brand's perspective, and we want you to buy BOOST. But we also want to be honest about why the formula looks the way it does.

BOOST v2 is 19 ingredients rather than 6 because there's more than one way to support natural testosterone, and hitting several of them at studied doses stacks better than hitting one hard. The six branded actives cover the biggest evidence bases — Testofen® on androgens and libido, KSM-66® on stress and cortisol, PrimaVie® on free testosterone in older men, Tesnor® on total testosterone, ForsLean® on body composition, and BioPerine® for absorption. The 13 supporting nutrients cover the raw materials the body needs to actually make and free testosterone.

Tongkat Ali isn't in there because we can't legally sell it in the UK. Boron isn't in there because the human trial evidence for testosterone support at typical supplement doses isn't strong enough to justify the formulation space. Every choice is defensible.

Health-claim compliance and what we can and can't say

Under UK and EU nutrition and health-claim law (retained post-Brexit), only specific, authorised health claims can be made on food supplements. Anything else — including any implication that a finished product raises testosterone, restores libido, improves erectile function or delivers a specific numerical hormonal outcome — is not permitted on-pack or in on-brand marketing.

Some of the ingredients in BOOST have their own authorised claims. Zinc, for example, has an EU-authorised claim that it "contributes to normal testosterone levels in the blood". Vitamin D has authorised claims around normal immune function and muscle function. We use the language that regulators have approved, and we don't stretch beyond it.

Ingredient-level research quoted in this piece (for example, effect sizes from Testofen® trials or PrimaVie® trials) refers to specific standardised extracts studied in specific clinical trials. It is not a claim about the finished product Himmense BOOST or about any competitor's finished product. Your individual result will depend on your baseline health, sleep, training, nutrition, stress and clinical circumstances. Nothing in this article is medical advice.

Frequently asked questions

Is Mars Men legal to sell in the UK?

Mars Men ships to the UK, but one of its ingredients — Tongkat Ali (Eurycoma longifolia) — is not authorised for sale as a food supplement in the UK. It is not on the EU Novel Foods approved list and is not registered under the UK's Traditional Herbal Registration scheme. This is why UK-made testosterone supplements like Himmense BOOST deliberately omit it.

Does Mars Men actually raise testosterone?

Mars Men's marketing implies specific outcomes ("from 198 to 687 in 8 weeks"), but under UK/EU regulation such finished-product claims are not permitted. The individual ingredients have varying levels of published evidence — some (fenugreek, shilajit, zinc, vitamin D) have supporting research at specific doses using specific standardised extracts. Mars Men uses generic (non-standardised) versions of these ingredients, so the research on branded extracts does not automatically transfer.

How much does Mars Men cost UK buyers all-in?

The advertised intro price is $39 USD (roughly £31 at typical exchange rates), which reverts closer to $118 for subsequent bottles if you don't stay on subscription. UK buyers should factor in card foreign-transaction fees (2.75-3% on most UK cards), potential VAT at 20% on personal supplement imports over the low-value threshold, plus Royal Mail or courier handling fees of £8-£12 if VAT is applied at the border. The realistic UK monthly cost is materially above the $39 headline.

Why is Mars Men's on-site rating (4.76) so different from Trustpilot (3.7)?

On-site review software (Yotpo, Judge.me, Okendo etc.) is controlled by the brand and can moderate or filter reviews before publishing. Trustpilot is independent and harder to curate. A gap of nearly a full star between on-site and Trustpilot is at the wider end of what's typical in DTC supplements.

What's the difference between generic fenugreek and Testofen® fenugreek?

Testofen® is a specific fenugreek seed extract standardised for a proprietary saponin complex called Fenuside™. It's the exact material used in the published human clinical trials on fenugreek and testosterone (Rao et al. 2016, Aging Male). Generic fenugreek can vary enormously in saponin content and does not automatically inherit the research done on Testofen®. Himmense BOOST uses Testofen® at 600mg — the same dose used in the trial.

Is one capsule a day enough?

The active ingredient doses in Himmense BOOST are set to match the doses used in the source clinical trials. Testofen® at 600mg, KSM-66® at 300mg, PrimaVie® at 300mg — those are trial-matched doses fitted into a single once-daily capsule. Products that require four to six capsules a day are typically splitting a similar dose load across multiple pills, not delivering more active per day. One capsule vs four is a convenience factor, not an efficacy one.

The bottom line

Mars Men is a well-marketed US testosterone supplement built on a short, generic formula that includes an ingredient not authorised for UK food-supplement sale. For a UK buyer, the total cost is meaningfully higher than the $39 headline once currency, shipping and possible VAT are added. The independent review picture on Trustpilot is more mixed than the on-site page suggests.

Himmense BOOST is a UK-made testosterone supplement with three times the ingredient count, six branded standardised extracts at clinically studied doses, transparent dosing on every active, one capsule a day, and a stable UK price of £31.49 with free delivery. It's built specifically for the UK market and the UK regulatory environment.

If you're a UK man deciding between the two — the ads you're seeing on Instagram or the formula that was built here — the evidence-informed choice is the one designed for where you actually live.

See what's inside Himmense BOOST →

Compare BOOST with other testosterone supplements

If you're weighing Mars Men against several options, we've written detailed comparisons of BOOST against the other testosterone supplements UK buyers commonly consider:

• Himmense BOOST vs Zapply T1 — the ingredient-by-ingredient breakdown for the UK's fastest-growing new testosterone brand
• Himmense BOOST vs Manual Testosterone Support — the UK telehealth platform's supplement
• Himmense BOOST vs Numan Testosterone Support — Amazon UK's best-selling testosterone booster
• Himmense BOOST vs Vitabiotics Wellman Max — the UK's most established men's supplement brand
• Himmense BOOST vs Testogen — the veteran natural testosterone booster
• Himmense BOOST vs TestoFuel — the muscle-building focused competitor
• Himmense BOOST vs Hunter Test — the premium-positioned option
• Himmense BOOST vs Prime Male — the men's-40+ focused competitor
• 10 Best Testosterone Supplements UK 2026 — Ranked by Ingredient Depth — the full listicle
• Best Testosterone Supplement UK 2026 — the definitive guide — the pillar page covering everything you need to know

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