I take Vit D supplements due to a measured Vit D deficiency, which is related to another condition, Neurofibromatosis Type 1. Long-term use of Nexium for GERD likely does not help. My dosing is based on measure response to the supplement. My current dose is 100mcg/4000IU qd. Note that Vit D is usually measure in either mcg or IU.

I also take Vit B and Magnesium supplements due to measured deficiencies with dose adjustment based on measured response. I am a strong believer in using objective measures whenever possible with any intervention we use.

I take vitamin D3 but not in connection with my ET condition. I use it because my internist recommends it for strong bones. I let the internist and hematologist know about any supplements I take, to avoid possible interactions with ET meds, but they usually lack info about supplements.

Taking Vit D supplements (for my Vitamin D deficiency) for me has had no effect on lowering platelets in blood tests.

Analytical Research Lab, in Phoenix, is a good way to test for supplement needs. I do the Hair Analysis…

I was having palpitations and started taking vitamin D and they stopped.