Vitamin D Supplementation

Vitamin D dosing should be individualized using lab levels, demographic factors, and health status. Standard vitamin D maintenance supplementation is typically 5,000–10,000 IU per day. Less-frequent, higher-dose supplementation may work slightly better than the same total dose taken daily. High-dose vitamin D supplements can trigger fatigue through pathways involving depletion of critical minerals. Excessive vitamin D supplementation depletes potassium and disrupts the electrical gradient needed for proper muscle contraction signaling. Because vitamin D is fat-soluble and stored in adipose tissue, missing a day or two causes no significant harm. Vitamin D is absorbed most effectively with a fat-containing meal. The recommended supplemental form is D3, the same form produced through sun exposure. Long-term daily supplementation with 10,000 IU of vitamin D3 over several years resulted in serious adverse effects in a documented case. Vitamin D toxicity symptoms included elevated blood calcium, fatigue, fluid retention, loss of appetite, and complications related to mineral imbalance. Corn syrup and maltodextrin in vitamin D supplements are counterproductive for anyone managing metabo…