Posted by Netch on February 27, 2009, at 5:44:39
In reply to Re: Vitamin D's effect on depression, posted by desolationrower on February 27, 2009, at 3:07:56
Vitamin D is a tricky vitamin to supplement. You don't want too much and not too little.
I take 10k IU during fall, winter and spring since I live on the 59th parallell - the sun's UV light is too weak during these months to make vitamin D3. During the summer months I only supplement those days I haven't had any bodyexposure to sunlight.
This picture shows the relationship between vitamin D3 supplementation and blood 25(OH)D levels:
Levels bellow 250 nmol/L 25(OH)D are considered safe. Basically supplementation up to 10k IU is safe.
According to Reinhold Vieth published cases of vitamin D toxicity with hypercalcemia all involve intake of more than 40k IU/d.