The maths show that indoor tanning is a great source of vitamin D is indisputable
AUGUST 1, 2009 - Tanning beds may be even more effective as a vitamin D producer than was previously believed. That's the consensus of new research published by Dr. Michael Holick's group at Boston University. Holick's group studied 15 people aged 20-53, tracking their vitamin D blood levels as they tanned in tanning equipment three times a week. How'd they do?
» 50 percent higher vitamin D blood levels after one week of tanning.
» 150 percent higher vitamin D blood levels after 5 weeks of tanning.
Bottom line: Un-natural supplements can't do that! Not at over-the-counter levels. Consider: Three tanning sessions a week will deliver the equivalent of 30,000-75,000 international units of vitamin D (depending on skin type and other factors) - levels that cannot possibly be obtained through any other source. Even fresh salmon from the stream has a maximum of only 1,000 IU of vitamin D - not enough to move vitamin D blood levels nearly as much as tanning.
VITAMIN D SCIENTISTS now target vitamin D blood levels of 40-60 ng/ml (nanograms per milliliter). Smart Tan is starting to call these levels "Natural Vitamin D levels" - amounts that are consistent only with natural outdoor living in sunny climates.