So here is a more negative view of progesterone and a person can end up wondering why sources vary so much:
The risk-benefit ratio associated with progesterone renders it unethical to prescribe. The benefits of it are extremely limited and unproven. Hormone protocols from well-informed gender clinics around the world do not routinely use progesterone and ethical doctors who are up to date in their...
www.gender.org.uk
Myth
There is a commonly perceived myth that progesterone increases breast size in the transwoman. This partly comes from a paper published some years ago documenting the microscopic appearance of breast tissue. It indicated that progesterone increased the size of the lactating ducts. Hence this is in accordance with the functions detailed above. The paper is not saying that breasts are bigger.
Further facts about Progesterone
Progesterone is produced in small quantities in the adrenals by men and women. It acts as a precursor to the formation of testosterone. ANY form of progesterone, whether naturally produced or artificially administered has the propensity for conversion into testosterone.
Commonly available progesterones / progestins: | | | Levenorgestrel | (testosterone analogue) | Most androgenic | Norethisterone | (testosterone analogue) | | Mexdroxy-
progesterone Acetate | (progesterone analogue) | | Dydrogesterone | (progesterone analogue) | Least androgenic | Drospirenone | (spironolactone derivative) | Antiandrogen | Cyproterone Acetate | (synthetic progesterone) | Antiandrogen |
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