A little bit of sun can do a whole lot of good. When the warm rays hit your bare skin, your body begins to produce vitamin D, or the “sunshine vitamin,” in response. This essential nutrient helps keep our bones strong and our heart healthy.
But as more and more Americans shun the sun for shady beach umbrellas, super-SPF sunscreen, and air-conditioned offices, so do have the rates of Vitamin D deficiency climbed. It’s estimated that almost three-quarters of pregnant women in America are vitamin D-deficient, predisposing their unborn children to all sorts of problems; furthermore, more than half of American children today are lacking in Vitamin D. Worldwide, the deficiency affects one billion people. In my practice, 80 percent of patients with Vitamin D blood tests are revealed to be deficient.
It’s clear we have a major epidemic on our hands. Symptoms of vitamin D deficiency may not be obvious, and it’s easy to assume you’re getting enough – but you may be assuming incorrectly.
How much vitamin D do I need?
How much vitamin D you need varies with age, body weight, percent of body fat, latitude, skin coloration, season of the year, use of sun block, individual variation in sun exposure, and – probably – how ill you are.
As a general rule, old people need more than young people, big people need more that little people, fat people need more than skinny people, northern people need more than southern people, dark-skinned people need more than fair skinned people, winter people need more than summer people, sun block lovers need more than sun block haters, sun-phobes need more than sun worshipers, and ill people may need more than well people.
What I, along with many of my colleagues around the country, are finding is that even in populations spending what we thought was adequate amount of time in the sun, there are low blood vitamin D levels. I am not sure why at this stage, but there is an easy and affordable solution: vitamin D supplementation.
Here are some guidelines:
Vitamin D3 – 2000 IU if your blood level is above 45ng/ml and for maintenance, I recommend 2,000-4,000 IU daily depending on age, weight, season, how much time is spent outdoors, where one lives, skin color and obviously blood levels. In other words if you are older, larger, living in the northern latitudes during the winter, are not getting sun and have dark skin, I recommend the higher maintenance dose.
Vitamin D3 – 5000 IU if your blood level is 30-45 ng/ml, I recommend you correct it with 5,000 of vitamin D3 a day for 3 months under a doctor’s supervision and then recheck your blood levels.
Vitamin D3 – 10,000 IU if your blood level is less than 30 ng/ml, I recommend you correct it with 10,000 of vitamin D3 a day under a doctor’s supervision and then recheck your blood levels after 3 months. It takes a good 6 months usually to optimize your vitamin D levels if you’re deficient. Once this occurs, you can lower the dose to the maintenance dose of 2,000 – 4,000 IU a day.
What are the symptoms of vitamin D deficiency?
There is no clear pattern of symptoms. In fact many people remain asymptomatic despite low levels. But here are the more common symptoms:
General muscle pain and weakness
High blood pressure
Constipation or diarrhea
What diseases are associated with Vitamin D deficiency?
Vitamin D deficiency has been shown to play a role in almost every major disease. This includes:
Osteoporosis and Osteopenia
17 varieties of Cancer (including breast, prostate and colon)
High blood pressure
Metabolic Syndrome and Diabetes
Infertility and PMS
Depression and Seasonal Affective Disorder
Chronic fatigue syndrome
What about vitamin D toxicity?
It is impossible to generate too much vitamin D in your body from sunlight exposure: your body will self-regulate and only generate what it needs. Although very rare, it is possible to overdose and become toxic with supplementation as vitamin D is a fat soluble vitamin and therefore stored in the body for longer periods of time. Therefore if you are taking 5,000 IU or more daily, you should have your blood levels monitored approximately every 3 months.
What blood test should I have to check my vitamin D levels?
The only blood test that can diagnose vitamin D deficiency is a 25-hydroxy-vitamin D (25 OH vitamin D). Unfortunately, some doctors are still ordering the wrong test, 1,25-dihydroxy-vitamin D. In fact a common cause of high 1,25-dihydroxy-vitamin D is a low 25(OH)D or vitamin D deficiency. So when doctors see the 1,25-dihydroxy-vitamin D is normal or high and tell their patients that they are OK, they are often vitamin D deficient.
Your doctor can and should do this test for you. If you don’t want to go through your doctor, the ZRT lab does a blood spot test that you can order without going through a doctor.
The current ranges for “normal” are 20 to 55 ng/ml. These are much too low! They may be fine if you want to prevent rickets or osteomalacia, but not for optimal health. The ideal range for optimal health is 50-80 ng/ml.
How often should I have a 25 hydroxy vitamin D blood test?
At least once a year especially at the beginning of winter. If you are supplementing, I suggest you monitor your vitamin D levels approximately every 3 months until you are in the optimal range. If you are taking high doses (10,000 IU a day) your doctor must also check your calcium, phosphorous, and parathyroid hormone levels every 3 months.
A few tips on supplementation
Always take your Vit D supplement with some fat, as it is a fat soluble vitamin. If you take it on an empty stomach or without any fat, it won’t be absorbed, so you are basically wasting your time (and money). When taking 5,000 IU a day or more, look for formulas that include Vit K, as the benefits of vitamin D are enhanced when combined with vitamin K, especially when it comes to heart health and bone strength.
Sources for this article include: