Supplement guides
Supplement guides, page 15
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
Why do different supplement brands share one formula?
Private label supplements explained: real label matches from our reviews, what the FDA rules say, and how to compare two formulas yourself.
ResearchWhy are some supplements everywhere in ads?
ClickBank gravity and affiliate commissions explained: why some supplements flood your feed, what the numbers show in our reviews, and what the FTC requires.
Red flagsHow can I tell if a health ebook is AI-written filler?
AI detectors guess wrong. Seven checks on author, sources, seller and refund show whether a health ebook is accountable or just filler.
SafetyShould I stop supplements before surgery? What to ask your surgeon
Ask before you stop or continue anything. What ASA and NIH sources say about supplements and surgery, plus questions for your team.
SafetyWhich supplements raise questions with blood thinners?
Vitamin K, ginkgo, garlic, fish oil, nattokinase: what MedlinePlus and NIH sources say about supplements and blood thinners.
SafetyDo blood sugar supplements interact with diabetes medicines?
Berberine, cinnamon and chromium can matter next to diabetes medicine. What NIH and MedlinePlus say, and what to ask before you buy.
SafetyCan supplements affect blood pressure medicines?
Licorice, bitter orange, hawthorn and potassium can matter next to blood pressure medicine. What the sources say and what to ask.
SafetyCan supplements clash with statins?
Red yeast rice, high-dose niacin, CoQ10 and grapefruit can matter next to a statin. What the NIH and FDA say and what to ask.
SafetyDo supplements affect thyroid medicine? What to ask your doctor
Calcium, iron, biotin and kelp can change how thyroid medicine works or how your tests read. A checklist to take to your pharmacist.
SafetyWhich supplements raise questions with antidepressants?
St. John's wort, 5-HTP and SAMe raise serotonin questions with antidepressants. What the sources say and a checklist for your pharmacist.
Guides are general information, not medical advice. Read how we review and our medical disclaimer.