Conventional advice tells us to supplement calcium, 1200 mg per day, to preserve bone health and reduce blood pressure.
Here’s a curious observation I’ve now witnessed a number of times: Some people who supplement this dose of calcium while also supplementing vitamin D sufficient to increase 25-hydroxy vitamin D blood levels to 60-70 ng/ml develop abnormally high levels of blood calcium, hypercalcemia.
This makes sense when you realize that intestinal absorption of calcium doubles or quadruples when vitamin D approaches desirable levels. Full restoration of vitamin D therefore causes a large quantity of calcium to be absorbed, more than you may need. In addition, two studies from New Zealand suggest that 1200-1300 mg calcium with vitamin D per day doubles heart attack risk.
We have 20 years of clinical studies demonstrating the very small benefits of supplementing calcium to stop or slow the deterioration of bone density (osteopenia, osteoporosis). These studies were performed with no vitamin D or with trivial doses, too small to make a difference. I believe those data have been made irrelevant in the modern age in which we “normalize” vitamin D.
Should hypercalcemia develop, it is not good for you. Over long periods of time, abnormal calcium deposition can occur, leading to kidney stones, atherosclerosis, and arthritis.
Until we have clarification on this issue, I have been advising patients to take no more than 600 mg calcium supplements per day. I suspect, however, that the vast majority of us require no calcium at all, provided an overall healthy diet is followed, especially one that does not leach out bone calcium. This means no foods like those made with wheat or containing powerful acids, such as those in carbonated drinks.
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Dr. Davis,
Since increasing my Vitamin D, Magesium and Melatonin I suddenly have very brittle, splitting fingernails. Any idea which if any of these caused this? Any suggestions?
Thanks
Love your blog!!!!!
Chances are the calcium supplement you are taking now is a rock source of calcium. The label will say "calcium carbonate", which is nothing more than limestone. AlgaeCal Plus contains an organic, plant-sourced calcium form derived from a unique South American marine algae called Algas Calcareas™.
think one of the greatest hurdles is overcoming misconceptions in the minds of regulators, doctors and patients alike. I just returned from a trip to Germany and colleagues there are amused about America's 3rd World-like medical records situation
I have celiac disease and osteopenia in my spine and no bone loss in my hips. I have a strong family history of osteoporosis as well.
Because my calcium intake is less than or equal to 500 mg I take:
600 mg calcium citrate at two seperate meals
1200 IU's D3
500 mg magnesium citrate
I track using fitday. I'm grain, legume, dairy, sugar and processed food free and follow a paleo type dietary plan.
Is this okay?
I meant:
600 mg calcium citrate in total but dosage is split between two seperate meals.
Reading all these posts I used to think of vitamin D and magnesium and K2 the same a most posters. Intuitively never took calcium, was up to 6000 mg of D3/ day to achieve a level of 43- up from 26.
That said, my serum calcium has trended upward to 10.3. I am now having a few blood tests to check for hyperparathyroidism! The foremost parathyroid doc in the USA is Dr. James Norman from Tampa, and his website is very informative and puts a different spin on what I thought I knew of these matters. Parathyroids is ALL he and his 2 colleagues do all day every day. Please give this a look to be fully informed on the matter of Vitamin D supplementation. http://www.parathyroid.com
I have no connection, but if I find out I have an adenoma on one of my parathyroids, this is where I will have it removed!
Jeanne ( RN,BSN)
Oops, meant to add I have also supplemented with 400-800mg of magnesium and 1 Life Extension K2 in addition to the Vitamin D for several years.
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