The ovaries are the primary glands that produce estrogen.
According to Johns Hopkins Medicine, the ovaries secrete both estrogen and progesterone. This makes them a key part of the endocrine system. Below is a table summarizing hormone production from the provided reference:
| Where the hormone is produced | Hormone(s) secreted |
|---|---|
| Ovaries | Estrogen |
| Ovaries | Progesterone |
| Parathyroid glands | Parathyroid hormone (PTH) |
| Thyroid gland | Thyroid hormone |
