Vitamin D and Balancing with Melatonin

I've been taking 5-10,000 iu? I did feel great, I boosted my levels from low 20s to 60+

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The issue I had was brief/interrupted sleep. Lots of waking. So I started to balance with melatonin (as I read as we age it could diminish. And it has loads of anti aging/health benefits).

Well I hit the jack pot. Taking .8-1.8 mg of Melatonin at night has led to longer, deeper more complete sleep I wake up in a good mood.

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Then in the morning continue my vitamin D. Anyone on a stack like this. I am trying to stay all natural, but I must say this combo has been the best I've ever felt.....Very early on in my journey but research about melatonin is coming out saying it can prevent hair loss, cancers etc...its being overlooked.