NMN Supplements: NAD+ Rise, Modest Gains, Product Risk
NMN raises blood NAD+ in trials, but longevity claims outrun the evidence. What doses studies use, what they show, and why product labels matter.
NMN Supplements: Human Evidence, Doses, and Safety
NMN can raise NAD markers in short trials, but human benefits remain narrow. Here is what the evidence says about dose, safety, and common claims.
Stair Climbing After 60: Useful, Not a Fitness Cure
Stairs look almost too ordinary to count as training. That is the appeal, and also the trap. The evidence suggests that short bouts of stair climbing can improve cardiorespiratory fitness, and may help some older adults train leg power. It does not show that a staircase replaces a rounded exercise plan, or that everyone should … Read more
Metabolic Flexibility: What It Means and Who Needs to Worry
Metabolic flexibility describes how readily your body switches between glucose and fat as fuel. The science is clearer on exercise than on supplements.
Slow breathing for stress: evidence, not a reset button
Slow breathing can ease stress quickly but modestly; it is a useful daily tool for nervous-system regulation, not a replacement for treatment.
Prebiotics for Gut Health: Food First, Supplement Second
Prebiotics feed helpful gut bacteria, yet food sources still beat powders in the evidence. Onions, beans, oats, and chicory outperform most branded supplements.
APOE Testing: Alzheimer’s Risk Marker, Not Destiny
APOE testing can clarify inherited Alzheimer’s risk and treatment safety, but it cannot predict disease and needs careful genetic counselling.
SHBG and Midlife Hormones: Useful Marker, Not Diagnosis
SHBG is one of those hormone markers that looks more decisive than it is. It can sharpen the meaning of a testosterone result, especially in midlife, but it cannot diagnose low testosterone, polycystic ovary syndrome, or metabolic disease by itself. The useful question is not whether the number is good. It is what the number … Read more
Caffeine Cut-Offs: Why Your Last Cup Needs a Clock
Caffeine can disturb sleep long after the buzz fades. A sensible cut-off is earlier than many people think, especially when the dose is high.
Green Tea Extract: Small Signal, Real Liver Caution
Green tea extract may slightly shift weight or lipids, but concentrated products have real liver-injury cautions. Here is how to judge the trade-off.