Vitamin D3 (Cholecalciferol)
The 'sunshine vitamin' that your body makes when UV rays hit your skin — it's essential for strong bones, a healthy immune system, and a surprising number of other things.
Benefits
- +Supports bone density and calcium absorption
- +Strengthens immune function
- +Linked to lower risk of depression and seasonal mood changes
- +May reduce risk of certain cancers (preliminary evidence)
- +Supports cardiovascular health
- +Important for muscle function and reducing fall risk in older adults
Dosage & Cost
The upper tolerable limit is 4000 IU for most adults, but many people need more — get your levels tested (25-OH vitamin D blood test) and adjust accordingly. Deficiency is extremely common.
Side Effects
- !Nausea or stomach upset at high doses
- !Calcium buildup (hypercalcemia) with long-term overconsumption
- !Possible kidney stone risk with excessive intake
- !Fatigue or headache if way overdone
Food Sources
- • Fatty fish (salmon, mackerel, sardines)
- • Egg yolks
- • Fortified milk and orange juice
- • Mushrooms (UV-exposed)
- • Sunlight exposure (10–20 min of direct skin exposure)
References & Links
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This page is for informational purposes only. The information here has not been evaluated by the Food and Drug Administration (FDA). No supplement discussed on this page is intended to diagnose, treat, cure, or prevent any disease. Please consult your doctor or a qualified healthcare professional before taking any dietary supplement.