A thermogenic is a broad term for any supplement that the manufacturer claims will cause thermogenesis , resulting in increased body temperature, increased metabolic rate, and consequently an increased rate in the burning of body fat and weight loss. Until 2004 almost every product found in this supplement category comprised the " ECA stack ": ephedrine , caffeine and aspirin . However, on February 6, 2004 the Food and Drug Administration (FDA) banned the sale of ephedra and its alkaloid , ephedrine, for use in weight loss formulas. Several manufacturers replaced the ephedra component of the "ECA" stack with bitter orange or citrus aurantium (containing synephrine ) instead of the ephedrine.
Oestrogen is broken down by the liver. But in women whose livers carry excess toxins – if you drink a lot , for instance, or are exposed to synthetic oestrogens called ‘xenoestrogens’ – the hormone might have a hard time being metabolised, so the body reabsorbs it. Chemicals that are xenoestrogens include parabens (often in skincare), benzophenone (which is found in some sunscreens) and Bisphenol-A (also called BPA), found in plastics. Choose BPA-free plastic bottles, or go for glass containers where possible.