The 50,000 IU dosage of vitamin D2 is only available through a prescription. Over-the-counter vitamin D is available in IU levels from 400 to 5,000. The higher level is often prescribed by doctors for patients who have extremely low vitamin D levels and need to load up on vitamin D as stated by the Vitamin D Council.
Vitamin D deficiency can lead to cellular changes that could stimulate cancerous cells according to Dr. Mark Hyman. A proper intake of vitamin D is important to cellular health, boosting the immune system and keeping bones strong. Sunlight is the best source of vitamin D, but supplements are popular because most people do not get enough sunlight.
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