Don Smith

Keep in mind that the starting dose (0.5 MED) and end dose (1.0 MED) were derived using the CIE EAS. Using the FDA EAS, it would be (approximately) a 1.0 MED start and 2.0 MED end. Since there was "slight pigmentation" in all subjects, it is obvious that the skin type 1's were really 2A or 2B.

However, even with this low "end" dose, a 40% increase is very impressive.

Let's hope we see more articles like this!
J Photochem Photobiol B. 2008 Feb 29 [Epub ahead of print]
Sun beds and cod liver oil as vitamin D sources.Porojnicu AC, Bruland OS, Aksnes
L, Grant WB, Moan J.
Department of Radiation Biology, Rikshospitalet-Radiumhospitalet Medical Center,
Montebello, 0310 Oslo, Norway.

The objective of this study was to (1) to determine the contribution of moderate
sun bed exposure to serum 25(OH)D(3) levels; (2) to estimate the decay time of a
high 25(OH)D(3) level obtained by sun bed exposure; and (3) to evaluate if the
recommended ingestion of vitamin D is sufficient to maintain the 25(OH)D(3)
concentration obtained by sun bed exposure. Ten volunteers (20-35 y.o.), skin
type I and II, living in Olso, Norway were whole body exposed twice per week to
the radiation of a commercial and approved sun bed (Life Sun S 100 W, Wolff
System), starting with 0.5 MED (minimal erythema dose) and escalating to up to 1
MED per exposure for 4 weeks. After that, half of the volunteers were given a
daily supplement of 200 IU vitamin D in the form of cod liver oil capsules,
while the other half of the persons received no supplements. Erythema did not
occurr at any time and a slight pigmentation was seen in most of the volunteers
after the sun bed exposures. Serum level of 25(OH)D(3) increased by about 40% on
the average. The initial serum 25(OH)D(3) level was different among the
volunteers (40-100nmol/L). Within eight weeks after the last exposure the
25(OH)D(3) level decreased to the initial value in all volunteers irrespective
of vitamin D supplementation or not.

eileen

good stuff (smiles) since our smiley faces don't work anymore!! lol

__________________
"under exposure to UV rays is as dangerous as overexposure....this is D life" eileen