CleanGuides
Plain-English guides to checking supplements yourself: how to read a lab report, and what the published reports show for each category.
Do “testosterone boosters” work? What the evidence and lab reports say
New (26 Oct 2026): what trials found for zinc, ZMA, tribulus, maca, fenugreek, ashwagandha and boron, the one authorised claim (zinc and normal testosterone levels), why tongkat ali is not allowed in EU foods, and what independent lab reports show. No shop links.
Read the guide →Men’s health and zinc supplements: heavy metals, lab reports and price per day (UK + EU)
New (26 Oct 2026): 15 zinc, maca, fenugreek and men’s blend products with independent reports (7 lab verified, 8 partial), metals vs EU limits, lab, batch and date; € and £ kept separate.
Read the guide →Lab-tested “testosterone boosters” in the UK & EU: what the reports show
New (26 Oct 2026): the short answer. Which products sold under that search term have full heavy-metal reports, the lowest results, and what is excluded.
Read the answer →Women’s health supplements: menopause, thyroid, iron and folate, lab reports and price (UK + EU)
New (30 Oct 2026): 20 products with independent reports (15 lab verified, 5 partial), metals vs EU limits, lab, batch and date; German brands EU-only, Sunday Natural also UK (£); € and £ kept separate.
Read the guide →Lab-tested women’s health supplements in the UK & EU: what the reports show
New (30 Oct 2026): the short answer. Which menopause, thyroid, iron and folate products have full heavy-metal reports, the top picks, and the two plain notes (arsenic on a thyroid blend; selenium dose on selenomethionine).
Read the answer →Oral collagen peptides: what they are, oral vs injectable, and UK, EU and US rules
New (26 Oct 2026): collagen powders are food supplements; injectable “research peptides” like BPC-157 are not. Which claims are allowed (none for collagen itself), and how the US treats supplements. No shop links.
Read the guide →Collagen peptides comparison: heavy metals, lab reports and price (UK + EU)
New (26 Oct 2026): twelve oral collagen powders with independent lab reports, ten lab verified, from EU and UK sellers; € and £ kept separate.
Read the guide →Do minerals need protein to work?
New (26 Oct 2026): albumin, iron, zinc and magnesium transporters, the Na/K pump and glutathione: what the viral “minerals need peptides” claim gets right and wrong, and EFSA’s 0.83 g/kg protein reference intake. No shop links.
Read the guide →Peptide bioregulators (Cytomax, Cytogen, Khavinson peptides): what the evidence says
New (26 Oct 2026): what they are, what the published research shows, why organ-restoring claims are not authorised in the EU or GB, and why we do not list them. No shop links.
Read the guide →Iodine and heavy metals in seaweed, kelp and sea moss supplements
New (26 Oct 2026): why seaweed needs two checks (iodine dose and heavy metals), EU limits, BfR’s 100 µg iodine advice, and what ConsumerLab, a Madrid public-health lab and CVUA Stuttgart found. No shop links.
Read the guide →Lab-tested kelp iodine supplements in the UK and EU (2026)
New (26 Oct 2026): the short answer. Three kelp iodine capsules are lab verified (all from German shops); lowest lead and cadmium, iodine per capsule against BfR’s 100 µg advice, and the one kelp option with a UK seller.
Read the answer →Lab-tested sea moss in the UK (2026)
New (26 Oct 2026): the honest answer. Only one UK sea moss has a readable lab report, and it is partial; what it shows and what a good sea moss report should include.
Read the answer →Seaweed, kelp and sea moss comparison: heavy metals, iodine and price (UK + EU)
New (26 Oct 2026): six kelp iodine capsules and sea moss products with recent independent lab reports (3 lab verified, 3 partial): metals vs EU limits, iodine per daily dose vs the 150 µg NRV, and price per day in € and £.
See the comparison →Supplement testing sites compared: Labdoor, ConsumerLab, Clean Label Project, Informed Sport and CleanAssay
New (26 Oct 2026): who does the testing, whether heavy-metal numbers are public, what it costs to read and how each site makes money, for buyers in the UK and EU.
Read the guide →How to read a supplement lab report (COA)
A plain-English checklist for reading a certificate of analysis: who tested it, which batch, what was measured, units, legal limits and red flags.
Read the guide →Lab-tested ashwagandha in the UK and EU (2026)
Which ashwagandha supplements sold in the UK and EU publish independent heavy-metal lab reports, what the reports show, and which are outdated.
Read the guide →L-theanine comparison: lab reports and price (UK + EU)
New (22 Oct 2026): two lab-verified L-theanine supplements, a UK capsule and an EU powder, side by side: heavy metals, measured purity where the report includes it, and price per day in £ and €.
See the comparison →Cleanest spirulina and chlorella in the UK and EU (2026)
New (22 Oct 2026): six lab-verified spirulina and chlorella powders ranked by lead, with cadmium, mercury and total arsenic from each batch report, red flags and price per day from EU sellers (Sunday Natural, Eltabia) in € and a UK seller (PlantPills) in £.
Read the answer →Spirulina and chlorella (greens) comparison: lab reports and price (UK + EU)
New (22 Oct 2026): the same six spirulina and chlorella powders in one sortable table: colour-coded heavy metals, red flags, lab and report date, fillers and price per day in € and £.
See the comparison →Cleanest supplements by category →
Not medical advice. Testing status can’t be bought.