What's the difference between vitamin D and vitamin D3?

There are two possible forms of vitamin D in the human body: vitamin D2 and vitamin D3. Both D2 and D3 are simply called “vitamin D,” so there's no meaningful difference between vitamin D3 and just vitamin D. Vitamin D3 is the form of vitamin D the human body makes when sunlight strikes the skin.

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And another question, can i take 10000 iu of d3 daily?

The Endocrine Society Practice Guidelines recommend that up to 10,000 IUs daily was safe for adults. This is in contrast to the recommended UL at 4,000 IU/d from the IOM. Also, can vitamin d3 cause heart palpitations? Some signs of heart complications associated with vitamin D toxicity include: an irregular heartbeat, which may be temporary or continual.

Why do I feel worse after taking vitamin D?

And some will find that taking vitamin D supplements makes them feel worse; probably because the high PTH turns the supplements into high concentrations of 1, 25 dihydroxy vitamin D which is the active form, causing symptoms of vitamin D toxicity. When taking vitamin D makes you feel worse, you should immediately stop. Then, is it ok to take vitamin d everyday? Unless your doctor recommends it, avoid taking more than 4,000 IU per day, which is considered the safe upper limit.