Progesterone, which regulates cyclical changes in the endometrium of the uterus and maintains a pregnancy These mental health effects birey also occur when steroid treatment is being withdrawn. Medical advice should be sought if worrying mood or behavioural changes occur. Even though "keto" is a standard prefix in organic chemistry, http://www.drugoffice.gov.hk/gb/unigb/tr.wikipedia.org/wiki/Vitamin