Vitamin D3 125 mcg (5000 IU) SupplementBest Seller

Certain herbal supplements such as creatine, ephedra, DHEA, Kava and chromium can cause kidney injury. Check with your primary care provider before using any vitamin or supplement after kidney donation.

Both vitamin D and vitamin K are fat-soluble vitamins that are beneficial for bone health. Vitamin K2 consumption aids in calcium being absorbed by the bone rather than in the arteries. Vitamin K2 does not affect vitamin D absorption. Taking vitamin D with a meal containing healthy fat will aid in its absorption. Vitamin K interacts with some blood thinners, so ask your physician before adding vitamin K if you are taking a blood thinner medication.

Vitamin D is a fat-soluble vitamin that dissolves in fat, not water. Therefore, this vitamin should be taken with a meal containing fat.

High doses of vitamin d, as well as high blood levels of vitamin D, may interfere with the body’s production of melatonin, resulting in a deterioration in sleep quality. Consult with your physician for the dosage that is right for you.

If you are taking Coumadin or Warfarin, we recommend consulting your doctor before adding any supplements to your diet.

A study published in The Clinical Journal of Pain found obese individuals with knee osteoarthritis who had higher levels of vitamin D experienced less knee pain than those with deficient or insufficient levels of vitamin D. In the study of 256 middle-aged and older adults with osteoarthritis, the participants provided a self-report of knee pain and completed functional performance tasks that included balancing, walking and rising from a sitting position to a standing position. The participants with healthy vitamin D levels had less knee osteoarthritis pain, and could also walk, balance and rise from sitting to standing better than obese participants with insufficient vitamin D levels.

How much is needed varies considerably based on age, skin tone, time of year, sun exposure, where one lives, weight, and other factors. Cooper Clinic suggests consulting with your physician on your specific intake based on your vitamin D test results, age, and health issues.

The recommended target level for vitamin D is open to debate. Most experts agree your vitamin D level should be at least 30 ng/ml. However, doctors at the Cooper Clinic in Dallas, Texas, recommend patients target at least 40 ng/ml as a baseline. A level of 50 ng/ml is considered optimal for brain health.

Vitamin D levels in humans vary dramatically by season, latitude and race. The avoidance of UV exposure has led to an epidemic of low vitamin D levels. There are very few food sources (fatty fish, cod liver oil, fortified milk and fortified cereals) of vitamin D. Most people will have higher vitamin D levels during warmer months due to intentional or unintentional sun exposure. People living in the northeastern United States are at higher risk for vitamin D deficiency due to the lack of sunshine for much of the year. Darker-toned individuals are at higher risk for deficiency due to higher melanin levels in the skin that block UV absorption.

The only way to know your vitamin D level is to have a blood test known as 25 hydroxyvitamin D. Because vitamin D comes from food, sunshine, and dietary supplements, the amount needed can vary from person to person. In blood tests, vitamin D (25-hydroxyvitamin D) is measured in either nanomoles per liter (nmol/L) or nanograms per milliliter (ng/mL). One nmol/L equals 0.4 ng/mL, so 20 ng/mL is the same as 50 nmol/L.

• Levels below 12 ng/mL (30 nmol/L) are too low and may weaken bones and affect health.
• Levels above 50 ng/mL (125 nmol/L) are too high and not recommended.

There are two primary reasons why most of us lack vitamin D, according to the authors of the Archives of Internal Medicine article. The most significant factor is the increased use of sunscreen. Sunscreen with a sun protection factor (SPF) of 15 decreases vitamin D synthesis by 99 percent. In addition, decreased outdoor activity and obesity are associated with vitamin D insufficiency.

A study published in the Journal of the Academy of Nutrition and Dietetics, Feb. 2015, found that vitamin D3 absorption increased by 32 percent when taken with a meal, where 30 percent of the calories in the meal came from fat.