[montag813]

PLEASE make sure you use Vitamin D3 that your body can actually metabolize. The #1 best-absorbed D3 in ConsumerLab.com's tests was Bluebonnet. My father in law has seen dramatic improvement since his heart attack. I take this every morning after waking up.
It has the 5,000 I.U. this study recommends in a single drop:

Bluebonnet Nutrition Liquid Vitamin D3 Drops 5000 IU

P.S. Consumer Lab found a further 20% increase in absorption if taken before or after an oil-based food, such as fish or nuts.

[ConservativeMind]

Montag813, I have a ConsumerLab membership and that does not show up.

https://www.consumerlab.com/vitamin-d/