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.
Guides on this page
Do cranberry and d-mannose supplements prevent urinary infections?
Cranberry, d-mannose and bearberry for UTIs: what Cochrane and a 2024 trial found, what bearberry safety looks like, and how supplement labels compare.
EvidenceDo herbal lung support supplements work? Mullein, thyme and the evidence
Mullein and thyme have folk use, and one thyme-ivy syrup was tested for acute bronchitis. See what the evidence covers and what lung supplement pages claim.
EvidenceDoes olive leaf extract lower blood pressure or blood sugar?
Small trials, mixed sugar data and why a hidden olive leaf dose cannot be matched to any study. What the research found and how to read a label.
SafetyIs DMSO in pain products safe? What the FDA labels say
What the FDA-reviewed DMSO labels say about absorption, odor and interactions, and why a DMSO pain drop with no stated concentration is hard to judge.
IngredientsWhy is piperine added to supplements, and is it safe?
Why supplements list black pepper extract or BioPerine, what the studies used, and why it matters if you take prescription drugs.
EvidenceDo L-tyrosine, DMAE and choline improve focus?
What studies tested for L-tyrosine, DMAE and choline, how label doses compare, and how to read a brain supplement label.
EvidenceDo amino acid HGH boosters raise growth hormone for real?
What studies found on arginine, lysine and ornithine for growth hormone, and how to check an HGH booster label.
EvidenceDo HMB and leucine supplements build muscle?
What trials used for HMB and leucine, what meta-analyses found, and how to check a muscle supplement label.
LabelsSupplement Facts vs Nutrition Facts: what is different
What the FDA says separates a Supplement Facts panel from Nutrition Facts, and how to read each line before you buy.
DosesNo amount listed for an ingredient: what it means
Hidden, stated or mismatched: what a missing ingredient amount means, what the FDA requires and how we score it.
Guides are general information, not medical advice. Read how we review and our medical disclaimer.