If you are not taking at least 1,000 IU of D3 daily, then you are probably dangerously low.
yes
serum level of vitamin D
A vitamin D level of 8 ng/mL is considered very low and indicates a deficiency. This deficiency can lead to weakened bones, muscle weakness, and increased risk of fractures. It is important to work with a healthcare provider to develop a plan to raise your vitamin D levels.
There is more than one reason that your vitamin D is low. It could be due to lack on sunshine or poor diet.
A blood test would show if you are low in Vitamin D.
milk
Yes, it is potentially helpful, and as a bonus it is also one of the cheaper vitamins you can find today. Inhaled steroids also don't work as well if you have a low vitamin D level.
No. It, in fact, is the opposite. Vitamin D is absorbed in the intestine, converted by UV radiation in the skin, and then helps absorb Calcium into the body. Vitamin D deficiency can be caused by a few things, a diet low in Vitamin D, low sun exposure, or it could be caused by a tumor in the parathyroid gland (but if you have low Calcium, that is not possible).
d
Rickets
No, it can not.
A common result of hyperparathyroidism is hypercalcemia, or an abnormally high level of calcium in the blood. Additionally, some, but not all patients who have this disease will also have an above-normal level of PTH or parathyroid hormone, as well as a low vitamin D level. The reason for a low vitamin D level in patients with hyperparathyroidism is a protective measure by the body. The primary purpose of vitamin D is to allow the intestines to absorb calcium. When the body detects higher than normal calcium, it restricts the amount of vitamin D that is produced by the skin.