Skin Care News

Don't believe everything you read, even if it's a study about supplements.

A JAMA article a few months ago examined the consistency between observational studies and randomized trials. They found that one fourth of the examined observational studies were refuted by later randomized trials. For example, the hormone replacement therapy used in post menopause women has been proven to be harmful by the Women’s Health Initiative Study because the combined estrogen-progestin may increase the risk of breast cancer and heart disease. The effects of vitamin E and C supplements have also been shown to be exaggerated (if not false) in observational studies. Coincidently, the first seemingly “decisively” positive findings for hormone and vitamins are all from the two population studies initiated by Harvard.

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Read more from this blogger: the replication of observational studies