February 21, 2011

I suppose the word “craze” sums up my feelings nicely. To elaborate, though, I have some concerns about widespread recommendations that many or most people should consider taking large doses of supplemental vitamin D over long periods of time.

When I’m thinking about supplements my first question usually involves how this nutrient shows up naturally. I think of vitamins and minerals as isolated constituents of foods, and like many constituents they often act very differently in isolation. We normally absorb vitamin D through our skin when exposed to sunlight, and I assume this is for good reason. How does oral supplementation differ? What is lost when we take vitamin D this way? I’m not saying that supplementary vitamin D isn’t useful – I’d just like to know a bit more before I recommend long-term high doses for my clients.

Alan Gaby’s article entitled “Vitamin D: Irrational Exuberance?” found here sums up some of my concerns quite nicely, with a generous helping of science to back him up.  Please check it out if you’ve been wondering about this as well.

About Camille Freeman, DCN, RH (she/her)

Hi there! I'm a clinical herbalist and nutritionist specializing in fertility and menstrual health. I run the Monday Mentoring community of practice and also offer continuing education programs for practicing herbalists and nutritionists (Check out this year's Deep Dive!). I'm also a former professor with the Maryland University of Integrative Health, where I taught physiology, pathophysiology, and mindful eating for 17 years. 

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