> Sunlight really is the best though The problem is that, for many people, their ability to synthesize Vitamin D from sunlight decreases as they age. (Also you

> Sunlight really is the best though The problem is that, for many people, their ability to synthesize Vitamin D from sunlight decreases as they age. (Also you have to be living at a latitude where you can get enough UV from sunlight.) Having your blood levels of Vitamin D checked regularly can help you to decide whether you need supplementation, and if you do, it can help you to adjust your dosage.