LEASTPROCESSED · SUPPLEMENTS · UK + US

The same lens, applied to the bottle.

Supplements get held to a different bar than food. We score them on what actually matters: bioavailable form (methylcobalamin vs cyanocobalamin), dose appropriateness (within RDA / safe upper limit), third-party testing (USP, NSF, ConsumerLab, Informed Sport), filler load, and heavy-metal screening — especially for protein powders and fish oil where it matters most.

Where a food source could replace a supplement, we say so and link back to the least-processed options on shelves. Editorial-only — no medical advice, no replacing your GP.

What our supplement score reads

30%

Third-party testing — USP / NSF / ConsumerLab / Informed Sport

22%

Bioavailable form (e.g. magnesium bisglycinate > oxide)

18%

Filler load — additives, artificial colours, unnecessary excipients

15%

Dose appropriateness vs RDA + safe upper limit

10%

Heavy-metal testing (fish oil, protein, greens)

5%

Source transparency — country / origin / manufacturer

Full rubric → /methodology/ · Rubric document → 2026_04_30_supplements_scoring_rubric.md

Browse 20 supplement categories

protein powder magnesium multivitamin for women vitamin D creatine multivitamin for men probiotic magnesium glycinate vs citrate pre-workout multivitamin omega-3 electrolyte powder iron supplement whey protein zinc supplement protein for muscle gain NSF certified supplements third-party tested supplements USP verified supplements no fillers

Affiliate partner · Bulk™

We're partnered with Bulk™ on the supplements vertical. Bulk's clean-label range — Pure Whey, Creatine Monohydrate (Creapure), Informed-Sport-tested protein, electrolyte powder — consistently scores high on third-party testing and low on filler load. We surface them in category pages where the score warrants and link out below.

We earn a commission from Bulk purchases made via our links. The score formula doesn't read affiliate data — see our editorial policy.

Not medical advice. Scores reflect ingredient transparency, bioavailable form, and testing rigour — not a recommendation for any individual. If you have a deficiency, take medication, are pregnant, breastfeeding, or have a chronic condition, talk to a GP or registered dietitian before starting any supplement.