Vitamin D up to 50,000IU is used for heart patients for a week. Otherwise you can take up to 10,000IU everyday for more energy. A doctor told me I should take 2,000IU and it made a difference real quick. I then started taking more after reading up on it.
Also take Magnesium for the run down feeling. It fixes all kinds of aches and pains. http://www.ancient-minerals.com/magnesium-deficiency/need-more
Vitamin C benefits
https://www.organicfacts.net/health-benefits/vitamins/health-benefits-of-vitamin-c-or-ascorbic-acid.html
Vitamin C dosage
http://www.consumerlab.com/answers/Is+it+possible+to+take+too+much+vitamin+C%3F/too_much_vitamin_c/
I don’t know what kind of heart problem you have but I take Serrapeptase for mine. I have Prinzmetal Angina. As long as I take my 2 tabs every night I have no pain.
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