Supplements

Evidence, labels, forms and safety limits for choosing supplements.

Pick a guide below. Each one explains what to look for and how to use the product safely. It also says when to ask a doctor or other expert first. Sources are listed at the end of every guide.

Supplements

Guides in this section

Creatine Monohydrate: Benefits, Dosing and How to Choose

More guides

Black Seed Oil: Benefits, Side Effects and How to Choose

Creatine Gummies: Do They Work, and How to Choose Them

D-Mannose: What It Is, What Trials Show, and How to Choose

Elderberry Syrup: What It May Do and How to Choose One

More guides

Apple Cider Vinegar Gummies: What They Do and What They Don't

Beet Root Powder: Nitrates, Exercise and Blood Pressure

Berberine Supplement: Blood Sugar, Cholesterol and Safety Facts

Best Ashwagandha Supplement: Doses, Evidence and Who Should Avoid

Best Milk Thistle Supplement: Silymarin, Evidence and Quality

Best Saw Palmetto Supplement: Prostate Evidence and Label Tips

Bilberry: Night Vision Myth, Eye Strain Evidence and Safety

Black Cohosh Supplement: Hot Flash Evidence and Liver Safety

Boswellia: Knee Arthritis Evidence, Safety and How to Choose

Chamomile Capsules: Anxiety and Sleep Evidence, Safety, Labels

Chlorella: What the Research Shows and How to Choose

Cinnamon Supplement: Ceylon vs Cassia, Blood Sugar and Safety

DGL Licorice: Heartburn and Indigestion Evidence, Safety, Labels

Dandelion Root: What It's Good For, Safety, Tea vs Capsules

Echinacea Supplement: Cold Evidence, Safety and How to Choose

Elderberry Gummies: Do They Work and How to Choose Safely

Fenugreek Supplement: Milk Supply, Blood Sugar and Safety

Garcinia Cambogia: Weight Loss Evidence and Liver Safety

Garlic Supplements: Cholesterol Evidence, Forms and Bleeding Risk

Ginger Capsules: Nausea Evidence, Doses and How to Choose

Ginkgo Biloba Supplements: Memory Evidence and Bleeding Risk

Ginseng Supplement: Asian vs American, Evidence and Safety

Grape Seed Extract: Blood Pressure, Cholesterol and Safety

Green Tea Extract: Weight, Cholesterol and the Liver Risk

Holy Basil (Tulsi) Supplement: Stress Evidence and How to Choose

Lemon Balm Supplement: Calm, Sleep and Cholesterol Evidence

Lutein and Zeaxanthin Supplements: AREDS2 Evidence Explained

Maca Root Supplement: Libido Evidence, Colors and How to Choose

Moringa Supplement: What Trials Show and How to Choose

Nettle Leaf: What It's Good For, Tea vs Capsules and Safety

Olive Leaf Extract: Blood Pressure Evidence and How to Choose

Oregano Oil Capsules: Carvacrol, Evidence and Safe Use

Passionflower Supplements: Anxiety, Sleep and Surgery Cautions

Peppermint Oil Capsules for IBS: Evidence, Timing and Safety

Quercetin Supplement: Allergy Claims, Evidence and Interactions

Resveratrol Supplement: Anti-Aging Hype vs Human Evidence

Rhodiola Rosea Supplements: Evidence, Labels and Safety

Slippery Elm: What It's Good For, Forms and Medicine Timing

Spirulina Supplement: Evidence, Purity and How to Choose

St. John's Wort Supplement: Depression Evidence and Interactions

Tongkat Ali Supplement: Testosterone Evidence and How to Choose

Tribulus Terrestris Supplement: Testosterone Claims vs Evidence

Turmeric Curcumin With Black Pepper: Absorption and Liver Safety

Valerian Root Supplements: Sleep Evidence, Safety and Forms

Vitex (Chasteberry): PMS Evidence, Safety and How to Choose

White Willow Bark: Back Pain Evidence and Aspirin-Like Risks

More guides

5-HTP Supplement: Mood, Sleep, Antidepressant Risks and Doses

Acetyl-L-Carnitine (ALCAR): Nerve Pain, Memory and Safety

Alpha Lipoic Acid Supplement: Neuropathy, Blood Sugar, Safety

Bacopa Monnieri: Memory Evidence, Doses and Safety Cautions

Brain Supplements: What Works, What Doesn't, and Red Flags

Chaga Mushroom Supplement: Evidence, Kidney Risk and Labels

CoQ10 Supplement: Ubiquinol vs Ubiquinone, Evidence, Safety

Collagen Gummies: Do They Work, and How Much Collagen Is Inside?

Collagen Peptides Powder: What It Does, Evidence and How to Pick

Cordyceps Supplement: Exercise Claims, Evidence and Safety

DIM Supplement: What It Does, Estrogen Claims and Safety

Electrolyte Powder: How to Choose Sodium, Sugar and Packets

GABA Supplement: Stress, Sleep, Safety and Whether It Works

Glucosamine Chondroitin: Does It Work for Arthritis? Safety Guide

Glutathione Supplement: Absorption, Skin Claims and Evidence

Hyaluronic Acid Supplements: Skin and Joint Evidence, Doses

L-Carnitine Supplement: Weight Loss, Exercise Evidence, Safety

L-Citrulline: Exercise, Blood Flow and Blood Pressure Evidence

L-Glutamine Supplement: Gut Health, Muscle Claims and Safety

L-Theanine Supplement: Calm, Focus, Sleep and What Studies Show

Lion's Mane Supplement: Capsules vs Powder, Evidence, Safety

Lysine Supplement: Cold Sores, Doses and What Studies Show

MSM Supplement: What It Is, Joint Pain Evidence, Powder Doses

Marine Collagen: Fish vs Bovine, Evidence and Allergy Cautions