Recommended Daily Allowances (RDA) drafted in North America are based on known diseases caused by deficiency’s. Knowing about rickets in children and bone softening in adults, the 1963 RDA’s were set at 200 I.U. for adults and 300-400 I.U. for children.
In 2010 the RDA’s were set at 600 I.U. with a safe upper limit of 4,000 I.U. This is far short for optimum health.
If you sunbathed in strong sunlight (summer) at noon for 10-20 minutes, your skin would create the equivalent of 10,000 I.U. of Vitamin D taken orally. That rather puts a perspective on the RDAs, doesn’t it?
And we can’t sunbathe during low sun season. At least it would be of no benefit.
Synthesis by the sun produces other photo-products not available through supplements. Also the Vitamin D produced by the sun’s synthesis lasts twice as long. So we must supplement because none of us gets the optimal amount from the sun in any season. Half of North Americans are deficient.
Life Extension Foundation Head, William Fallon, says 275,000 lives would be saved if Vitamin D levels were raised to optimum levels.
Dr. Michael Holick, world Vitamin D expert says a daily dose of 2,000-5,000 I.U. a day if perfectly safe over long term. A person can take up to 10,000 I.U. a day for at least 5 months without any signs of toxicity (or sunbathe in the tropics for 10-20 minutes every day at noon – I like that!)
And don’t think you get it from food. North America has very few foods rich in Vitamin D. Take your supplements of Vitamin D without complaint. It’s a very small pill with no unpleasant taste.
You want strong and healthy bones, so the question you need to ask yourself is, are you getting enough Vitamin D?
Check us out on Facebook and tell us how you get your Vitamin D!