Lab-tested “testosterone boosters” in the UK & EU: what the reports show

Q: Do testosterone boosters work?

Mostly not in men with normal levels. Zinc helps restore testosterone in men who are zinc-deficient, but trials of ZMA in men with normal zinc found no change; tribulus has not raised testosterone in human trials; maca did not change hormones in a 12-week trial; fenugreek and ashwagandha have small, mixed trial results. A 2020 study of 50 “T booster” products found only about a quarter of their claims had any supporting data. See our guide for the studies.

Q: Which “testosterone booster” has the cleanest lab report?

In our list, Sunday Natural Zinc 25 mg + vitamin C: lead, cadmium, mercury and arsenic were all below the reporting limit (GBA report 26020434-006, batch L02609, 5 May 2026). It is a plain zinc supplement, not a herbal blend.

Q: Are herbal men’s blends lab tested?

Some publish certificates, but none we found has a full numeric heavy-metal report for a sample that matches the product name. Nature Love Energiefluss für Männer and Nature Heart Männer Formel X12 Pro have pass/fail or limit-level results, and Sunday Natural Libo M has numeric results for a sample with a different name. We list all three as “Partial report”.

Q: Is tongkat ali legal in the UK and EU?

In the EU it is an unauthorised novel food: EFSA could not establish its safety in 2021 because of genotoxicity concerns, and Dutch and Norwegian authorities have acted against products. It is not on GB’s authorised novel food list either. We do not list it.

Q: Can I buy these in the UK?

Of the lab-verified products, only the two Sunday Natural products (zinc and black maca) have a UK seller in our data (sunday-natural.co.uk, £ prices). The others are sold by German shops in €; we have not checked whether they deliver to the UK.

Short answer:

No supplement is authorised in the UK or EU to say it boosts testosterone.
The only authorised claim is “Zinc contributes to the maintenance of normal testosterone levels in the blood”.
So we looked for what sits behind products sold under that search term: published, independent heavy-metal reports.
Seven products we checked are lab verified with numeric lead, cadmium, mercury and arsenic results for a named batch, all within EU limits: five zinc supplements (VitaMoment Zink-Histidin, MoleQlar Zink, edubily Zink-Komplex, Vitabay Zink 25 mg, Nature Heart Ionic Zink drops), Sunday Natural Zinc 25 mg + vitamin C and Sunday Natural Organic Black Maca extract.
Lowest metals: Sunday Natural Zinc (all four below the reporting limit, GBA, May 2026), also the only lab-verified zinc with a UK seller (£9.
90 for 120 capsules, about £0.
08 a day, checked 26 Oct 2026).
One warning: MoleQlar’s latest batch measured 14 mg zinc against 20 mg on the label.
Eight more products, including every multi-herb “men’s” blend we found, have only partial reports.
We do not list tongkat ali (an unauthorised novel food in the EU), turkesterone, DHEA, prohormones or SARMs.

Guide: do “testosterone boosters” work? What the evidence and lab reports say →

Full comparison: zinc, maca, fenugreek and men’s blends, metals, lab, batch and price per day →

Ashwagandha is compared separately (with a safety note) →

Data from published lab reports only; updated 2026-11-01. Not medical advice. Testing status can’t be bought.

Full men's health comparison: sortable table of every product →

Lab results

Product	Seller	Lab-test status	Pb	Cd	Hg	As	Price	Red flags
VitaMoment Zink-Histidin (zinc bisglycinate + copper + L-histidine), 120 capsules	VitaMoment (vitamoment.de, DE) · EU	Lab verified21 Jul 2026Report	<0.020 (well under the EU limit or below detection)	0.020 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	0.098 (no EU limit)	€19.97 / 120 capsules ≈ €0.17 per day at 1 capsule a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 3 red flags 25 mg zinc a day is EFSA’s adult upper level from all sources (2006) and the UK Expert Group on Vitamins and Minerals’ safe upper level from supplements (2003); do not add other zinc-containing supplements on top. Contains rice flour as a filler. The sample was sent in by the brand: check the batch number on your pack.
MoleQlar Zink (zinc bisglycinate + picolinate) 20 mg, 60 capsules	MoleQlar (moleqlar.com, DE) · EU	Lab verified25 Sep 2026Report	0.036 (well under the EU limit or below detection)	0.015 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	<0.040 (well under the EU limit or below detection)	€14.90 / 60 capsules ≈ €0.25 per day at 1 capsule a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 3 red flags Latest batch (127740) measured 14 mg zinc per capsule against 20 mg on the label; the lab says this is outside the EU tolerance. Contains acacia fibre as a filler. The sample was sent in by the brand: check the batch number on your pack.
edubily Zink-Komplex (bisglycinate, citrate, gluconate) 15 mg, 400 capsules	edubily (edubily.de, DE) · EU	Lab verified20 Oct 2026Report	0.070 (well under the EU limit or below detection)	0.023 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	<0.040 (well under the EU limit or below detection)	€44.95 / 400 capsules ≈ €0.11 per day at 1 capsule a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 1 red flag The sample was sent in by the brand: check the batch number on your pack.
Vitabay Zink 25 mg (zinc citrate) vegan tablets, 120 tablets	Vitabay (vitabay.de, DE) · EU	Lab verified13 Jul 2026Report	0.59 (well under the EU limit or below detection)	0.09 (well under the EU limit or below detection)	<0.005 (well under the EU limit or below detection)	<0.5 (well under the EU limit or below detection)	€11.99 / 120 tablets ≈ €0.050 per day at ½ tablet a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 4 red flags 25 mg zinc a day is EFSA’s adult upper level from all sources (2006) and the UK Expert Group on Vitamins and Minerals’ safe upper level from supplements (2003); do not add other zinc-containing supplements on top. Lead 0.59 mg/kg, the highest in this list (20% of the 3.0 mg/kg limit); arsenic reporting limit is high (0.5 mg/kg). Contains microcrystalline cellulose and calcium carbonate as fillers. The sample was sent in by the brand: check the batch number on your pack.
Nature Heart Ionic Zink Tropfen (zinc drops), 50 ml	Nature Heart (nature-heart.de, DE) · EU	Lab verified6 Mar 2026Report	<0.020 (well under the EU limit or below detection)	0.061 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	<0.040 (well under the EU limit or below detection)	€24.90 / 50 ml (seen 26 Oct 2026). The page does not state how many 10-drop servings a bottle holds, so we can’t calculate a daily cost. EU seller (Germany); no UK seller found.	⚠ 2 red flags No number of daily servings per bottle stated, so we can’t calculate a daily cost. The sample was sent in by the brand: check the batch number on your pack.
Sunday Natural Zinc 25 mg (bisglycinate) + vitamin C, 120 capsules	Sunday Natural (sunday-natural.es, EU) · EU + Sunday Natural (sunday-natural.co.uk) · UK	Lab verified5 May 2026Report	<0.020 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	<0.040 (well under the EU limit or below detection)	€9.90 / 120 capsules ≈ €0.083 per day at 1 capsule a day on sunday-natural.es; £9.90 / 120 capsules ≈ £0.083 per day on sunday-natural.co.uk (calculated, checked 26 Oct 2026). € and £ prices are separate sellers, not converted.	⚠ 2 red flags 25 mg zinc a day is EFSA’s adult upper level from all sources (2006) and the UK Expert Group on Vitamins and Minerals’ safe upper level from supplements (2003); do not add other zinc-containing supplements on top. The sample was sent in by the brand: check the batch number on your pack.
Sunday Natural Organic Black Maca 10:1 extract, 100 capsules	Sunday Natural (sunday-natural.es, EU) · EU + Sunday Natural (sunday-natural.co.uk) · UK	Lab verified12 Aug 2026Report	0.092 (well under the EU limit or below detection)	0.027 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	0.065 (no EU limit)	€16.90 / 100 capsules ≈ €0.17–€0.34 per day at 1–2 capsules a day on sunday-natural.es; £16.90 / 100 capsules ≈ £0.17–£0.34 per day on sunday-natural.co.uk (calculated, checked 26 Oct 2026). € and £ prices are separate sellers, not converted.	⚠ 1 red flag The sample was sent in by the brand: check the batch number on your pack.
Sunday Natural Libo M Complex (fenugreek, ashwagandha, maca, zinc blend), 120 capsules	Sunday Natural (sunday.nl, EU) · EU + Sunday Natural (sunday-natural.co.uk) · UK	Partial reportReport	0.074 (well under the EU limit or below detection)	0.015 (well under the EU limit or below detection)	<0.010 (well under the EU limit or below detection)	0.045 (no EU limit)	€29.90 / 120 capsules ≈ €1.00 per day at 4 capsules a day on sunday.nl; £29.90 / 120 capsules ≈ £1.00 per day on sunday-natural.co.uk (calculated, checked 26 Oct 2026). € and £ prices are separate sellers, not converted.	⚠ 3 red flags The lab sample is named “Libido Enhancer”, which does not match this product’s name. Contains ashwagandha: see our ashwagandha safety note (Denmark bans it in food; Germany and France advise some groups not to take it). The seller markets this product for men; we do not repeat marketing about hormones or libido. The only authorised testosterone claim in the UK and EU is that zinc contributes to the maintenance of normal testosterone levels in the blood.
Nature Heart Zink Pure (zinc bisglycinate) 10 mg, 240 capsules	Nature Heart (nature-heart.de, DE) · EU	Partial reportReport	NT (not tested)	NT (not tested)	NT (not tested)	NT (not tested)	€26.90 / 240 capsules ≈ €0.11 per day at 1 capsule a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 2 red flags Partial report: the published lab report measures zinc content (and microbiology) but not heavy metals. The sample was sent in by the brand: check the batch number on your pack.
brandl® Zink Kapseln (zinc bisglycinate) 25 mg, 180 capsules	Brandl Nutrition (brandl-nutrition.de, DE) · EU	Partial reportReport	NT (not tested)	NT (not tested)	NT (not tested)	NT (not tested)	€19.90 / 180 capsules ≈ €0.11 per day at 1 capsule a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 5 red flags Partial report: the published lab report measures zinc content (and microbiology) but not heavy metals. Brandl told us on 29 Oct 2026 that this published report is for an earlier formula without rice flour. The current batch (with rice flour) is being tested externally for zinc, microbiology and lead, cadmium, mercury and arsenic; we'll update this page when we see that report. 25 mg zinc a day is EFSA’s adult upper level from all sources (2006) and the UK Expert Group on Vitamins and Minerals’ safe upper level from supplements (2003); do not add other zinc-containing supplements on top. Contains rice flour as a filler. The sample was sent in by the brand: check the batch number on your pack.
Nature Love Zink Bisglycinat 25 mg, 365 tablets	Nature Love (nature-love.de, DE) · EU	Partial reportReport	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	NT (not tested)	€18.99 / 365 tablets ≈ €0.052 per day at 1 tablet a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 3 red flags Pass/fail certificate only: it states compliance with EU or German limits but gives no measured values, so we list it as a partial report. 25 mg zinc a day is EFSA’s adult upper level from all sources (2006) and the UK Expert Group on Vitamins and Minerals’ safe upper level from supplements (2003); do not add other zinc-containing supplements on top. The sample was sent in by the brand: check the batch number on your pack.
Nature Love Bio Maca Rot (organic red maca), 180 capsules	Nature Love (nature-love.de, DE) · EU	Partial reportReport	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	NT (not tested)	€22.99 / 180 capsules ≈ €0.51 per day at 4 capsules a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 3 red flags Pass/fail certificate only: it states compliance with EU or German limits but gives no measured values, so we list it as a partial report. No batch number and no arsenic result on the confirmation. The sample was sent in by the brand: check the batch number on your pack.
Nature Love Bio Bockshornklee (organic fenugreek seed), 240 capsules	Nature Love (nature-love.de, DE) · EU	Partial reportReport	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	NT (not tested)	€21.99 / 240 capsules ≈ €0.37 per day at 4 capsules a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 3 red flags Pass/fail certificate only: it states compliance with EU or German limits but gives no measured values, so we list it as a partial report. No batch number and no arsenic result on the confirmation. The sample was sent in by the brand: check the batch number on your pack.
Nature Love Energiefluss für Männer (citrulline, arginine, tribulus, maca, ginseng blend), 90 capsules	Nature Love (nature-love.de, DE) · EU	Partial reportReport	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	Pass* (certificate states compliance, no figure)	NT (not tested)	€22.99 / 90 capsules ≈ €0.77 per day at 3 capsules a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 3 red flags Pass/fail certificate only: it states compliance with EU or German limits but gives no measured values, so we list it as a partial report. The seller markets this product for men; we do not repeat marketing about hormones or libido. The only authorised testosterone claim in the UK and EU is that zinc contributes to the maintenance of normal testosterone levels in the blood. The sample was sent in by the brand: check the batch number on your pack.
Nature Heart Männer Formel X12 Pro (tribulus, ginseng, ashwagandha, arginine, zinc blend), 90 capsules	Nature Heart (nature-heart.de, DE) · EU	Partial reportReport	<3.0 (well under the EU limit or below detection)	<0.5 (well under the EU limit or below detection)	<0.1 (well under the EU limit or below detection)	<1.0 (well under the EU limit or below detection)	€34.90 / 90 capsules ≈ €1.16 per day at 3 capsules a day (calculated, checked 26 Oct 2026). EU seller (Germany); no UK seller found.	⚠ 5 red flags Metals are reported only as “below” values at about the legal limits, so the report shows compliance but not actual levels. Report is from 16 Oct 2025 (about a year old). Contains ashwagandha: see our ashwagandha safety note (Denmark bans it in food; Germany and France advise some groups not to take it). The seller markets this product for men; we do not repeat marketing about hormones or libido. The only authorised testosterone claim in the UK and EU is that zinc contributes to the maintenance of normal testosterone levels in the blood. The sample was sent in by the brand: check the batch number on your pack.

Heavy-metal colours: Well under the EU limit (below half) or below detection Near the EU limit (half the limit up to the limit) Over the EU limit Grey: no EU limit (arsenic), not tested, or the lab’s reporting limit is above the EU limitEU 2023/915 limits for food supplements: lead (Pb) 3.0, cadmium (Cd) 1.0, mercury (Hg) 0.10 mg/kg. Values in mg/kg. NT = not tested; c = calculated by us from µg per serving.

EU 2023/915 limits for food supplements: lead 3.0, cadmium 1.0, mercury 0.10 mg/kg. “Pass (no value)” means the certificate states compliance without a measured figure. “—” means no readable report on file.

About Men's Health

What it is: Supplements marketed for men’s health: mainly zinc (alone or with copper, vitamin C or histidine), plus herbs such as maca and fenugreek and multi-ingredient “men’s” blends. Often searched for as “testosterone boosters”.
Common forms: Capsules, tablets or liquid drops. Zinc forms in our list: bisglycinate, picolinate, citrate, gluconate and sulfate.
Typical label doses: Zinc products in our directory give 10–25 mg zinc a day. Maca products give 450–900 mg extract or 3,000 mg powder a day; the fenugreek product 2,600 mg seed powder.
Note: 25 mg zinc a day is EFSA’s adult upper level from all sources and the UK Expert Group on Vitamins and Minerals’ safe upper level from supplements; long-term high zinc can cause copper deficiency. Ashwagandha, often found in men’s blends, is not allowed in foods in Denmark, and Germany’s BfR and France’s ANSES advise some groups not to take it (see the safety note on this page). Tongkat ali is an unauthorised novel food in the EU and we do not list it.

Authorised health claims (EU and GB registers)

“Zinc contributes to the maintenance of normal testosterone levels in the blood.” Condition: at least a source of zinc (EU rules); applies to zinc only, not to herbs. Sources: EU register · EU Regulation 432/2012 · GB NHC register (Checked on the registers 2026-10-26)
“Zinc contributes to normal fertility and reproduction.” Condition: at least a source of zinc (EU rules). Sources: EU register · EU Regulation 432/2012 · GB NHC register (Checked on the registers 2026-10-26)

Information only, not medical advice. Food supplements are not intended to diagnose, treat, cure or prevent any disease. Speak to a healthcare professional before use, especially if pregnant or on medication.

FAQ

Do testosterone boosters work?

Mostly not in men with normal levels. Zinc helps restore testosterone in men who are zinc-deficient, but trials of ZMA in men with normal zinc found no change; tribulus has not raised testosterone in human trials; maca did not change hormones in a 12-week trial; fenugreek and ashwagandha have small, mixed trial results. A 2020 study of 50 “T booster” products found only about a quarter of their claims had any supporting data. See our guide for the studies.

Which “testosterone booster” has the cleanest lab report?

In our list, Sunday Natural Zinc 25 mg + vitamin C: lead, cadmium, mercury and arsenic were all below the reporting limit (GBA report 26020434-006, batch L02609, 5 May 2026). It is a plain zinc supplement, not a herbal blend.

Are herbal men’s blends lab tested?

Some publish certificates, but none we found has a full numeric heavy-metal report for a sample that matches the product name. Nature Love Energiefluss für Männer and Nature Heart Männer Formel X12 Pro have pass/fail or limit-level results, and Sunday Natural Libo M has numeric results for a sample with a different name. We list all three as “Partial report”.

Is tongkat ali legal in the UK and EU?

In the EU it is an unauthorised novel food: EFSA could not establish its safety in 2021 because of genotoxicity concerns, and Dutch and Norwegian authorities have acted against products. It is not on GB’s authorised novel food list either. We do not list it.

Can I buy these in the UK?

Of the lab-verified products, only the two Sunday Natural products (zinc and black maca) have a UK seller in our data (sunday-natural.co.uk, £ prices). The others are sold by German shops in €; we have not checked whether they deliver to the UK.

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