Pregnanolone is a steroid hormone that is derived from progesterone. It has various functions within the body and has been linked to improving mood, reducing anxiety and even improving memory. Some synonyms for Pregnanolone include Allopregnanolone, 3α-Hydroxy-5α-pregnane-20-one, and 3α,5β-Tetrahydroprogesterone. These synonyms are often used interchangeably with Pregnanolone. Allopregnanolone is specifically known for its calming effects on the brain and has been shown to reduce anxiety symptoms. 3α-Hydroxy-5α-pregnane-20-one is simply the chemical name for Pregnanolone. 3α,5β-Tetrahydroprogesterone is another name for Allopregnanolone and is often used in scientific literature.