In low, depressed older adults, a year changed none of nine outcomes
Dutch researchers recruited older adults at once low in vitamin D, depressed and physically limited. A year of 1,200 international units a day doubled their blood levels.
What the study found
The trial that picked the perfect candidates found nothing
Dutch researchers recruited older adults who were at once low in vitamin D, depressed and physically limited, the exact person supplementation is sold to. A year of 1,200 international units of vitamin D3 a day doubled their blood levels and moved none of nine outcomes.
The caveat · 155 people could hide a small effect
Only 155 people took part, so a small real effect could hide inside that. Entry required a level in the insufficient band rather than severe deficiency, which leaves open whether people much further down would respond. What makes the result carry more than its size suggests is that not one of nine outcomes moved in either direction.