Blood sugar
- Has research support
- Berberine, Magnesium
- Weak or mixed evidence
- Alpha-lipoic acid (ALA), Chromium, Zinc, Cinnamon (Ceylon), Gymnema sylvestre
- Popular, but no good evidence
- Bitter melon, Banaba leaf
Evidence Finder
Which supplements actually have evidence?
Pick a concern and tick what applies to you. You will see which ingredients have support in trials in people, which have weak or mixed evidence, and which are popular without good evidence, with the cautions that matter for your situation. Your answers stay in your browser.
This is not medical advice and does not tell you what to take. It shows what the published evidence says for people in your situation. Talk to your doctor before starting any supplement.
Step 1
What would you like help with?
Coming next, as we re-check each guide against its sources: Weight, Prostate, Joints, Brain and nerves, Eyes, Teeth and gums.
At a glance
What the evidence shows, by concern
Tinnitus
- Weak or mixed evidence
- Melatonin, Vitamin B12, CoQ10
- Popular, but no good evidence
- Zinc, Ginkgo biloba, Vinpocetine, Lipo-Flavonoid
Method
How we sort the evidence
- Every entry comes from one of our guides, which we check against the studies, Cochrane reviews and NIH pages it cites. Each category shows the date it was last checked.
- Has research support means randomized trials in people found a real effect for this concern. It does not mean the effect is large, or that it applies to everyone.
- Weak or mixed means small, inconsistent or uncontrolled studies, or a benefit seen only in people who were deficient.
- Popular, but no good evidence means the best trials found no benefit, the evidence is too thin, or there is a safety concern. We do not link to products in this group.
- Your situation never moves an ingredient to a better group. It changes the order and the cautions you see. A blood test showing a deficiency does not make a vitamin a treatment for tinnitus.
- We have not lab-tested any product. Links marked Amazon are affiliate links; they do not decide which group an ingredient is in.