What does the research actually show?
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Longevity supplements
Does fisetin slow aging?
Not shown in people.
Does metformin slow aging in people without diabetes?
Not shown in people without diabetes.
Does NMN slow aging?
Not shown in people so far.
Does rapamycin slow aging in people?
Not shown in people.
Does resveratrol slow aging?
Not shown in people.
Does spermidine slow aging in people?
Not shown in people.
Does taurine slow aging?
Not shown in people.
Does urolithin A improve muscle health with age?
Unclear: small trials, mixed results.
Everyday supplements
Does ashwagandha reduce stress and anxiety?
Possibly, but the evidence is weak.
Does berberine help with weight loss and blood sugar?
Lowers blood sugar in diabetes; weight unclear.
Does collagen reduce skin aging?
Unclear; higher-quality trials found no effect.
Does creatine improve memory and brain health?
Possibly a small boost to memory.
Does fish oil prevent heart disease?
Little or no effect in most trials.
Does lion's mane improve memory?
Unclear. Only four trials, with mixed results.
Does magnesium help you sleep?
Not clearly; trials disagree.
Does melatonin help you sleep?
A small effect, clearer in children.
Do probiotics improve gut health?
Some strains may help some symptoms.
Does vitamin D prevent colds and infections?
Not clearly; any effect looks small.
Diet and food
Does coffee help you live longer?
Linked to lower death risk; cause unproven.
Does intermittent fasting help with weight loss?
Yes, but about like calorie cutting.
Is moderate drinking good or bad for your heart?
Not shown to help; may harm.
Does red meat raise cancer and heart disease risk?
Linked to higher risk, especially processed meat.
Are seed oils bad for your heart?
Not clearly; the evidence conflicts.
Do artificial sweeteners cause weight gain?
Trials say no; population studies disagree.
Are ultra-processed foods bad for your health?
Linked to worse health; cause not proven.
Lifestyle practices
Does cold plunging help recovery and mood?
Eases soreness a little; mood unproven.
How many steps a day lower the risk of early death?
About 6,000 to 10,000 steps; fewer if older.
Does red light therapy work for skin?
Maybe a little; trials are small.
Does sauna use lower heart disease risk?
Possibly, but not proven in trials.
How much sleep do adults need for good health?
Lowest risk at about 7 hours.
Does strength training help you live longer?
Linked to longer life; not proven.
Every study, explained
Each of the 642 on-topic papers has its own plain-language page: what it tested and found, how much it counts, who has a stake, and how it fits the answer to its question.
- Ashwagandha and Stress 24 studies
- Berberine, Weight and Blood Sugar 28 studies
- Coffee and Lifespan 15 studies
- Cold Plunges and Recovery 30 studies
- Collagen and Skin 22 studies
- Creatine and Memory 21 studies
- Daily Steps and Lifespan 17 studies
- Fisetin and Aging 12 studies
- Fish Oil and the Heart 21 studies
- Intermittent Fasting and Weight 26 studies
- Lion's Mane and Memory 6 studies
- Magnesium and Sleep 16 studies
- Melatonin and Sleep 20 studies
- Metformin and Aging 26 studies
- Moderate Drinking and the Heart 21 studies
- NMN and Aging 29 studies
- Probiotics and the Gut 28 studies
- Rapamycin and Aging 16 studies
- Red Light and Skin 7 studies
- Red Meat, Cancer and the Heart 30 studies
- Resveratrol and Aging 22 studies
- Sauna and the Heart 21 studies
- Seed Oils and the Heart 13 studies
- Sleep Length and Health 22 studies
- Strength Training and Lifespan 26 studies
- Sweeteners and Weight 32 studies
- Taurine and Aging 13 studies
- Ultra-Processed Food 38 studies
- Urolithin A and Muscle 9 studies
- Vitamin D and Infections 33 studies
How it works
For each question, we search PubMed, the main index of medical research. Two AI models read every abstract on their own. A third settles where they disagree, checks every number against the paper, and writes the page with fixed rules. A person checks each short answer before search engines may list the page.
Confidence across the 31 questions. Most answers are low or very low: many popular health questions rest on small or short studies.