Vitamin D and Optimal Health

This guide addresses symptoms of low vitamin D. When sunshine is scarce, vitamin D levels in our bodies drop.

Low levels of this crucial vitamin can weaken immunity and we become more vulnerable to colds and the flu. A lack of vitamin D can also exacerbate joint and muscle pain, breathing difficulties and depression.

How much do you need? Should you take D2 or D3?

Learn the signs of vitamin D deficiency in children and adults and how to interpret blood test results. Find out how to correct vitamin D deficiency without overdosing, whether with sun exposure or supplements.

Avoid vitamin D toxicity from high-dose supplements.

This eGuide is available only as an online resource.