There is an old study often cited by Peat in regards to liver health and estrogen. That study found that vitamins B1 (thiamine) and B2 (riboflavin) are crucial for the deactivation/metabolism of estrogen by the liver.
Vitamins B1 & B2 Are Required For Estrogen Inactivation By Liver
The study...
Vitamin D is one of the most versatile substances in Peat world. It is actually a steroid and not a true vitamin, and as a steroid it is expected to have effects on other steroids. Its role in opposing estrogen, together with the other fat-soluble vitamins, is well-known. Now, this study shows...