Nutrition and wellness, with the sources attached
Nearly 300,000 people were given antioxidant pills in trials. They did not live longer, the best-run studies hint they died slightly sooner, and beta-carotene raised lung cancer risk in smokers.
A daily multivitamin shifts cancer risk by around one percentage point and does nothing for heart disease or death. The memory headline traces back to a single trial.
Only one human trial here compared magnesium forms side by side. Citrate and an amino-acid chelate were absorbed better than oxide, which did no better than a dummy capsule. Glycinate was not in it.
How far a dose moves your blood level depends on what you weigh and where you start. Dose relative to body weight explained 34.5% of the variation between groups of people taking supplements.
Vitamin D absorbed 32% better when it was swallowed with a meal containing fat. Iron is the reverse problem, and the coffee rule runs one way: before the meal is fine, after is not.
