http://en.wikipedia.org/wiki/Vitamin_DThe exact long-term safe dose of vitamin D is not known. In 1997 the U.S. Dietary Reference Intake Tolerable Upper Intake Level (UL) of vitamin D for children and adults was set at 50 micrograms/day (2,000 IU), but this is viewed as outdated and overly restrictive. A 2007 risk assessment suggested that 250 micrograms/day (10,000 IU) in healthy adults should be adopted as the tolerable upper limit.[39] In adults, sustained intake of 2500 micrograms/day (100,000 IU) can produce toxicity within a few months.[2] For infants (birth to 12 months) the tolerable UL is set at 25 micrograms/day (1000 IU), and vitamin D concentrations of 1000 micrograms/day (40,000 IU) in infants has been shown to produce toxicity within 1 to 4 months. Other sources indicate that the threshold for vitamin D toxicity in humans is 500 to 600 micrograms per kilogram body weight per day."[40] In rats an oral LD50 of 619 mg/kg is noted.[41] All known cases of vitamin D toxicity with hypercalcemia have involved intake of or over 1,000 micrograms/day (40,000 IU)
optimaalinen 25-hydroxy-vitamin D -taso on jotain 60.0-80.0 ng/mL.
tämän saavuttamiseksi vaaditaan ilmeisesti yleensä 125-250 mikrogramman annoksia D-vitamiinia päivässä, koska ihmiset saa niin vähän aurinkoa.
hassua, että RDA-arvo on 5 mikrogrammaa.
taidan mennä kohta verikokeeseen.