Supplement guides
Supplement guides, page 6
Plain-English guides on labels, doses, real prices, free trials and refunds. Written to help you check a product, not to sell you one.
Lutein and zeaxanthin eye supplements: what AREDS2 tested
What the AREDS2 trial gave people, who it enrolled, and how generic eye vitamin offers stack up against those doses.
LabelsMagnesium labels: elemental vs compound weight, and the 350 mg limit
Elemental vs compound weight, how much magnesium is in oxide, citrate and glycinate, the 350 mg supplement limit, and a checklist for reading the panel.
DosesMelatonin labels: how much is really in the bottle?
What lab studies found in melatonin bottles and gummies, what doses trials used, and how to check a label before you buy.
EvidenceMenopause supplements: what black cohosh and soy evidence shows
What NCCIH says about black cohosh, soy, red clover and other menopause supplements, the liver and bleeding risks, and how to vet a menopause offer.
EvidenceNattokinase supplement claims: what the trials really show
What FU means on a label, what four human nattokinase studies found, why results disagree, and the clotting caution to raise with your doctor.
EvidenceNerve pain supplements: what evidence exists for ALA and B vitamins
What NINDS, MedlinePlus and recent trials say about alpha lipoic acid, benfotiamine and B vitamins, plus red flags on nerve supplement pages.
IngredientsNitric oxide supplements: study doses of citrulline and arginine
The doses of L-citrulline and L-arginine used in studies, how small the results were, and how to check a nitric oxide booster label.
LabelsFish oil labels: why 1000 mg is not 1000 mg of EPA and DHA
How to read a fish oil Supplement Facts panel, add EPA and DHA per serving, and compare bottles fairly.
EvidenceOral probiotics for teeth and gums: what the evidence shows
Oral probiotics have small, short trials behind them, tied to specific strains. See what was tested and how sales pages compare.
EvidencePlacebo effect and supplement testimonials: why stories mislead
Why testimonials mislead even when sincere, what placebo-controlled means, what the FTC says about typical results, and a checklist for sales pages.
Guides are general information, not medical advice. Read how we review and our medical disclaimer.