A very good video summary on dose needed to maintain healthy vitamin D levels by Dr. Eric Berg
Note how much D3 is needed.
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Vitamin D
The important thing about supplements is to know what you are buying, what it is for and to treat a "known" deficiency.
Taking supplements without knowing your personal status, dosing, etc. is a waste of money and potentially harmful.
The following "nutrients", however, are in short supply naturally making supplementation beneficial in general:
1. vitamin D (because most people avoid the sun and in winter, there is no "sun" strong enough to make vitamin D)
2. vitamin K2 (because most people no longer eat food that has spoiled naturally - food is sanitized eliminating K2)
3. magnesium (because soils are depleted due to modern farming)
4. selenium (same as 3 above)
5. zinc (same as 3 above)
As we age, other nutrients become harder to absorb:
1. biotin
2. vitamin B12 (B vitamins in general)
Other supplements may be justified depending on individual need (turmeric & other spices) and diet limitations (i.e. vegan, no dairy, etc.), but the list above is due to nature no longer providing what our ancestors had in abundance.
