LONDON (Reuters) - Vitamin D is vital in activating human defences and low levels suffered by around half the world's population may mean their immune systems' killer T cells are poor at fighting infection, scientists said on Sunday. The findings by Danish researchers could help the fight against infectious diseases and global epidemics, they said, and could be particularly useful ...

WASHINGTON (Reuters) - Supermarket lights help keep spinach fresh and producing new vitamins, U.S. government researchers reported on Wednesday. The surprising findings should apply to other fresh vegetables and may offer insights into how to keep produce fresher longer, the researchers reported in the Journal of Agricultural and Food Chemistry. They may also suggest ways to boost nutrients in fresh ...

NEW YORK (Reuters Health) - People looking to improve their heart health by lowering their cholesterol levels won't find help from calcium and vitamin D supplements, according to a new study. While claims have been made for a beneficial effect of calcium and vitamin D on cholesterol levels, supporting evidence is thin, the study's lead author, Dr. Swapnil Rajpathak ...

SAN FRANCISCO (Reuters) - A group including a California nonprofit organization is suing fish oil manufacturers and pharmacies that sell the popular supplements over their purported toxicity. The lawsuit, filed Tuesday in San Francisco Superior Court, claims that the makers and sellers of certain supplements found to contain high levels of PCB compounds -- man-made industrial chemicals -- have failed to alert consumers ...