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Supplement Evidence Check

Start with your goal, then check the supplement evidence

Browse paper evidence by goals like sleep, fatigue, stress, and by individual ingredients.

1Search an ingredient
2Choose a question
3Review evidence and cautions
1Search ingredient
2What are you curious about?
Choose an ingredient to see available effects and caution topics.

Select an ingredient from the list first.

Explore database

Browse by goal and keep the ingredient tier table in view

Start with the topic you care about, then compare the full ingredient tier table below. Tiers classify evidence; they are not purchase rankings.

Browse goals

Start by goal

Start with the goal or concern you want to understand first.

Ingredient tier table

Ingredient tier table

Compare representative tiers, evidence scores, and caution signals across ingredients.

Tier B

Limited but observed evidence

Rhodiola

Tier B
Updated This Month10 new papers
Caution:Low
Papers:92 studies

Creatine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:77 studies

Ashwagandha

Tier B
Updated This Month10 new papers
Caution:Low
Papers:116 studies

HMB

Tier B
Updated This Month10 new papers
Caution:Low
Papers:72 studies

Citrulline

Tier B
Updated This Month10 new papers
Caution:Low
Papers:76 studies

Chromium

Tier B
Updated This Month10 new papers
Caution:Low
Papers:86 studies

Fiber

Tier B
Updated This Month10 new papers
Caution:Low
Papers:148 studies

Melatonin

Tier B
Updated This Month10 new papers
Caution:Low
Papers:120 studies

Psyllium

Tier B
Updated This Month10 new papers
Caution:Low
Papers:61 studies

Betaine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:60 studies

Potassium

Tier B
Updated This Month10 new papers
Caution:Low
Papers:50 studies

Omega-3

Tier B
Updated This Month10 new papers
Caution:Low
Papers:93 studies

Chondroitin

Tier B
Updated This Month10 new papers
Caution:Low
Papers:67 studies

Plant Sterols

Tier B
Updated This Month10 new papers
Caution:Low
Papers:71 studies

Vitamin C

Tier B
Updated This Month10 new papers
Caution:Low
Papers:101 studies

Zinc

Tier B
Updated This Month10 new papers
Caution:Low
Papers:51 studies

Selenium

Tier B
Updated This Month10 new papers
Caution:Low
Papers:51 studies

Coenzyme Q10

Tier B
Updated This Month10 new papers
Caution:Low
Papers:94 studies

Probiotics

Tier B
Updated This Month10 new papers
Caution:Low
Papers:102 studies

Glucosamine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:80 studies

Quercetin

Tier B
Updated This Month10 new papers
Caution:Low
Papers:89 studies

L-Carnitine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:68 studies

Saffron

Tier B
Updated This Month10 new papers
Caution:Low
Papers:97 studies

Ginseng

Tier B
Updated This Month10 new papers
Caution:Low
Papers:91 studies

Vitamin D

Tier B
Updated This Month10 new papers
Caution:Low
Papers:114 studies

Magnesium

Tier B
Updated This Month10 new papers
Caution:Low
Papers:50 studies

Iron

Tier B
Updated This Month10 new papers
Caution:Low
Papers:50 studies

Taurine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:81 studies

Glycine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:93 studies

5-HTP

Tier B
Updated This Month10 new papers
Caution:Low
Papers:56 studies

Niacin

Tier B
Updated This Month10 new papers
Caution:Low
Papers:59 studies

Whey Protein

Tier B
Updated This Month10 new papers
Caution:Low
Papers:104 studies

Vitamin B12

Tier B
Updated This Month10 new papers
Caution:Low
Papers:96 studies

Inositol

Tier B
Updated This Month10 new papers
Caution:Low
Papers:88 studies

Berberine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:117 studies

Folate

Tier B
Updated This Month10 new papers
Caution:Low
Papers:94 studies

Riboflavin

Tier B
Updated This Month10 new papers
Caution:Low
Papers:130 studies

Prebiotics

Tier B
Updated This Month10 new papers
Caution:Low
Papers:118 studies

Inulin

Tier B
Updated This Month10 new papers
Caution:Low
Papers:90 studies

L-Theanine

Tier B
Updated This Month10 new papers
Caution:Low
Papers:97 studies

Tier C

Early or exploratory research

Calcium

Tier C
Updated This Month10 new papers
Caution:Low
Papers:52 studies

Collagen

Tier C
Updated This Month10 new papers
Caution:Low
Papers:97 studies

EAA

Tier C
Updated This Month10 new papers
Caution:Low
Papers:61 studies

Sodium Bicarbonate

Tier C
Updated This Month10 new papers
Caution:Low
Papers:62 studies

Lemon Balm

Tier C
Updated This Month10 new papers
Caution:Low
Papers:58 studies

Ginkgo

Tier C
Updated This Month10 new papers
Caution:Low
Papers:115 studies

Vitamin B6

Tier C
Updated This Month10 new papers
Caution:Low
Papers:90 studies

Tyrosine

Tier C
Updated This Month10 new papers
Caution:Low
Papers:77 studies

SAMe

Tier C
Updated This Month10 new papers
Caution:Low
Papers:70 studies

Hyaluronic Acid

Tier C
Updated This Month10 new papers
Caution:Low
Papers:66 studies

Thiamine

Tier C
Updated This Month10 new papers
Caution:Low
Papers:82 studies

Iodine

Tier C
Updated This Month10 new papers
Caution:Low
Papers:72 studies

Vitamin K

Tier C
Updated This Month10 new papers
Caution:Low
Papers:142 studies

Biotin

Tier C
Updated This Month10 new papers
Caution:Low
Papers:88 studies

NAC

Tier C
Updated This Month10 new papers
Caution:Low
Papers:109 studies

Vitamin A

Tier C
Updated This Month10 new papers
Caution:Low
Papers:63 studies

Manganese

Tier C
Updated This Month10 new papers
Caution:Moderate
Papers:50 studies

Alpha-Lipoic Acid

Tier C
Updated This Month10 new papers
Caution:Low
Papers:54 studies

Copper

Tier C
Updated This Month10 new papers
Caution:Low
Papers:51 studies

Vitamin E

Tier C
Updated This Month10 new papers
Caution:Low
Papers:116 studies

Valerian

Tier C
Updated This Month10 new papers
Caution:Low
Papers:68 studies

D-Ribose

Tier C
Updated This Month10 new papers
Caution:Low
Papers:52 studies

GABA

Tier C
Updated This Month10 new papers
Caution:Low
Papers:90 studies

Lion's Mane

Tier C
Updated This Month10 new papers
Caution:Low
Papers:90 studies

Phosphatidylserine

Tier C
Updated This Month10 new papers
Caution:Low
Papers:61 studies