Progesterone is a naturally occurring steroid hormone that plays a crucial role in the menstrual cycle, pregnancy, and embryonic development. Primarily produced in the ovaries after ovulation, the adrenal glands, and, during pregnancy, by the placenta, it prepares the uterus for implantation of a fertilized egg and helps maintain pregnancy. Beyond reproduction, progesterone also affects brain function, bone health, and the immune system. Synthetic versions or bioidentical progesterone are used therapeutically for various conditions, including menstrual disorders, menopausal symptoms, and as part of assisted reproductive technologies. It is available in several forms, including oral capsules, topical creams, vaginal suppositories, and intramuscular injections, though the injectable form is not covered in this context. (Source: NIH National Library of Medicine, MedlinePlus)
Deep dive
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Known interactions
Category rule: peptide × hormone
Note
Injectable peptides plus hormones can have overlapping or compounding effects that aren't always well characterized.
Track bloodwork with a provider; don't assume combinations are neutral.
Frequently asked
Sources referenced
["American College of Obstetricians and Gynecologists","Cochrane Library","DrugBank","Examine.com","Mayo Clinic","MedlinePlus","NIH National Library of Medicine","NIH Office of Dietary Supplements (ODS)","PubChem"]
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