Supplement guides
Supplement guides, page 9
Plain-English guides on labels, doses, real prices, free trials and refunds. Written to help you check a product, not to sell you one.
Supplements and pregnancy: what to ask your doctor first
What NIH, MedlinePlus and the FDA say about supplements in pregnancy, which ingredients carry warnings, and the questions to bring to your appointment.
EvidenceTestosterone booster supplements: what the research says
What systematic reviews found on tribulus, fenugreek and tongkat ali, and how to check label doses against the research.
LabelsThird-party tested supplements: what the seals mean and how to verify
What third-party testing seals cover, who pays for them, how logos get misused, and how to verify a product and lot number.
EvidenceDo topical pain creams and patches work? What the evidence says
Capsaicin, lidocaine, diclofenac and menthol: what MedlinePlus, NCCIH and the FDA say, plus how to read a pain cream sales page.
IngredientsTurmeric and curcumin absorption claims: what to check
Turmeric powder, 95% curcuminoids, piperine: learn the label math behind curcumin absorption claims, what studies found and the liver safety warning.
DosesVitamin B12 doses: is a 1,000 mcg label too much?
B12 RDA is 2.4 mcg and no upper limit exists. See why labels show 1,000 mcg or more, how the forms compare and who should test first.
LabelsVitamin D IU vs mcg: how to convert a supplement label
1 mcg equals 40 IU. Learn the RDA, the 4,000 IU adult upper limit and how real supplement labels, including one at 8,000 IU, measure up.
SafetyWeight loss supplements and hidden ingredient warnings
What the FDA found in weight loss products, including sibutramine, why hidden drugs are risky, and warning signs to check before you buy.
RegulationWhat does a cGMP certified supplement mean?
cGMP is a rule every supplement maker must follow, not an FDA badge. What it covers, what registration means, and how to check a claim.
DosesHow much zinc is too much in a supplement?
Zinc RDA is 8 to 11 mg and the adult upper limit is 40 mg. Learn to read the label, tally stacked products and spot doses above the ceiling.
Guides are general information, not medical advice. Read how we review and our medical disclaimer.