Supplements

By Dr. David Taylor, MD, PhD · 33 articles

Supplements are regulated differently from medicines. The FDA does not approve them for safety or effectiveness before they are sold, so the claims on the label have not been checked by the agency. That is why I put the most weight on third-party testing seals such as USP or NSF, on the form and dose of the nutrient, and on whether the research supports the use printed on the bottle.

The hub is grouped by goal: vitamins and minerals, probiotics and gut health, sleep and stress, heart and joint, and protein and hydration. If you are new to supplements, start with the guides on reading a label and timing your doses. A supplement makes the most sense when it fills a known gap, such as low B12 on a blood test. Check with your doctor first if you are pregnant or take blood thinners or thyroid medicine.

Vitamins & Minerals

7 Best Calcium Supplements of 2026

Calcium supplements for bone health and osteoporosis. Carbonate vs citrate, tablet vs gummy vs liquid, and USP-verified picks with vitamin D, compared.

7 products reviewed · Updated Oct 18, 2026

7 Best B12 Supplements of 2026

B12 supplements for vegans, seniors and deficiency. Methylcobalamin vs cyanocobalamin, sublingual vs capsule, and USP or NSF-certified picks compared.

7 products reviewed · Updated Nov 10, 2026

10 Best Vitamin K2 Supplements of 2026

Vitamin K2 supplements compared: MK-7 vs MK-4, all-trans MenaQ7 purity, D3 and K2 combos, and the clinical bone dose for osteoporosis, by a physician.

10 products reviewed · Updated Oct 18, 2026

7 Best Iron Supplements of 2026

Iron supplements for anemia, pregnancy and women. Ferrous sulfate vs bisglycinate, tablets vs liquids vs gummies, and a pick that is gentler on the gut.

7 products reviewed · Updated Oct 18, 2026

8 Best Multivitamins for Women of 2026

Multivitamins for women compared: gummies, tablets and whole-food capsules by iron content, folate form and age, with picks for women over 40 and over 50.

8 products reviewed · Updated Nov 1, 2026

7 Best Biotin Supplements of 2026

Biotin supplements for hair and nails, with a doctor's honest take on dosing, lab test interference, who actually needs biotin, and our top picks.

7 products reviewed · Updated Oct 31, 2026

9 Best Eye Vitamins of 2026

Eye vitamins compared: AREDS 2 for macular degeneration, lutein picks and dry eye omega-3, and who actually benefits. PreserVision AREDS 2 tops our list.

9 products reviewed · Updated Oct 30, 2026

9 Best Sea Moss Supplements of 2026

Sea moss supplements compared: capsules, gel, gummies and powder by sourcing, dose, and iodine and thyroid safety, with Nutrivein Organic as our top pick.

9 products reviewed · Updated Oct 28, 2026

7 Best Zinc Supplements of 2026

Zinc supplements compared: picolinate, bisglycinate, gluconate and lozenges by absorption, dose and copper balance, with picks for colds, men and women.

7 products reviewed · Updated Oct 25, 2026

7 Best Prenatal Vitamins of 2026

Prenatal vitamins compared: methylfolate vs folic acid, chelated iron, DHA and third-party testing, with picks for nausea, vegans and iron-free gummies.

7 products reviewed · Updated Oct 22, 2026

The Best Vitamin B Complex Supplements of 2026

Vitamin B complex supplements with B6 doses checked against the upper limit, methylated vs folic acid forms, and picks for women and seniors. Thorne leads.

14 products reviewed · Updated Oct 20, 2026

Iron Supplements and Constipation: How to Prevent It

Why iron supplements cause constipation and how to prevent it: alternate-day dosing, the gentlest iron forms, timing rules, and what to do if you're backed up.

Guide · Updated Aug 12, 2026

Essential Vitamins and Supplements for Seniors

The vitamins and supplements that matter after 60: B12, vitamin D, calcium, magnesium, omega-3 and protein, with senior RDAs, interactions and what to skip.

Guide · Updated Jul 22, 2026

Probiotics & Gut Health

Sleep & Stress

Heart & Joint

Protein & Hydration

How to Choose and Take Supplements

Tools and data