Understand your health. Make better-informed decisions.
Clear, evidence-informed guides covering health conditions, symptoms, nutrition, supplement ingredients and everyday wellness — written for people, not for doctors.
Explore health topics
Popular health guides
Symptoms & conditions
Start with what you are noticing, or with a diagnosis you have been given.
Ingredient encyclopedia
Explore the evidence behind commonly used supplement ingredients — what each one is, what human studies show for specific uses, typical amounts studied, and safety considerations.
Health questions, answered directly
- Can stress raise blood sugar?
Yes. Cortisol and adrenaline tell the liver to release glucose and make cells less responsive to insulin. The effect is small in most healthy people and larger in diabetes.
- Can supplements help erectile dysfunction?
Modestly, sometimes, in mild ED — L-citrulline has the best small-trial evidence, ginseng and tongkat ali weaker signals. Nothing over the counter approaches PDE5 inhibitors, and new ED still needs a medical check first.
- Can supplements lower blood sugar?
A few ingredients — berberine most convincingly — lower glucose modestly in trials. The effect is small next to medication or weight loss, and several interact with diabetes drugs.
- Do eye vitamins work?
Yes for exactly one use — the AREDS2 formula slows progression in diagnosed intermediate AMD by ~25%. No for prevention in healthy eyes, cataract, floaters, screens and "vision restoration." Omega-3 helps some dry eye modestly; bilberry is folklore.
- Do fat burners work?
Essentially no. The best-studied ingredients produce under 1–2 kg versus placebo at most; several famous ones produce nothing; stimulant blends carry the category's real risks. A 500-calorie deficit outperforms the entire shelf.
- Do immune boosters work?
Boosting is not a thing the immune system does on command. What trials support: correcting vitamin D or zinc deficiency, zinc lozenges by strict protocol (~1–2 days off a cold), vitamin C modestly with regular use, elderberry maybe. Sleep, vaccines and exercise outperform the shelf.
Supplement research
We examine supplement formulas, ingredient evidence, label transparency, pricing and safety considerations. Our reviews distinguish between evidence for a finished product, evidence for its individual ingredients, and claims made by the manufacturer — and say plainly when we found no clinical studies of a product itself.
Supplements are not medicines. Nothing we publish should replace prescribed treatment, medical monitoring or a conversation with your own doctor or pharmacist.
How we research
We start from government health agencies, systematic reviews and clinical trials.
An editor checks every claim against its source and removes anything unsupported.
Product facts are checked against the manufacturer’s label and marked when we cannot confirm them.
Pages carry a review date and are re-checked on a rolling schedule.