That statement is incorrect. The pineal gland is primarily responsible for the production of melatonin, a hormone that regulates sleep-wake cycles.

Calcium levels are regulated by the following:

* Parathyroid glands: These glands release parathyroid hormone (PTH), which increases blood calcium levels by stimulating bone resorption (breaking down bone to release calcium), increasing calcium absorption in the intestines, and reducing calcium excretion in the kidneys.

* Thyroid gland: The thyroid gland produces calcitonin, which acts to lower blood calcium levels by inhibiting bone resorption and promoting calcium deposition in bone.

* Kidneys: The kidneys play a critical role in regulating calcium levels by filtering calcium from the blood and adjusting the amount of calcium excreted in the urine.

* Intestines: The intestines absorb calcium from the diet, and this process is regulated by vitamin D and PTH.

So, while the pineal gland is an important part of the endocrine system, it is not involved in calcium regulation.