Vitamin D deficiency: what ‘low’ means in ng/mL, who is at risk and when a test is worth it
Under 12 ng/mL is deficiency, 20+ is adequate. Who is at risk, when a 25-OH test makes sense, how much vitamin D is safe, plus food, sun and supplements.
Under 12 ng/mL is deficiency, 20+ is adequate. Who is at risk, when a 25-OH test makes sense, how much vitamin D is safe, plus food, sun and supplements.