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Also known as: Cholecalciferol, Vitamin D
Strong evidence for bone health, immune function, and mood. Up to 42% of US adults are deficient. Athletes who train indoors are at higher risk.
Amount
2000-5000 IU daily
Timing
With a fat-containing meal for absorption
Notes
Get blood levels tested (target 40-60 ng/mL). Higher doses may be needed to correct deficiency. Take with vitamin K2.
Track your Vitamin D3 intake alongside your macros in FitCommit.
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Essential for calcium absorption
Activates T-cells and innate immune system
Deficiency linked to depression
Receptors in muscle tissue, supports strength
Toxicity at very high doses
Do not exceed 10,000 IU/day without testing
Elevated calcium
Only at toxic levels, take K2 alongside
Important. Deficiency worsens during calorie restriction. Maintain 2000-5000 IU daily.
Important for overall health and optimal hormonal function during muscle building.
$0.03-0.10
per day
Excellent value
Vitamin D3 is generally safe for daily use at recommended doses. Safe at 2000-5000 IU/day for most adults. Get blood levels tested for precise dosing. Consult your doctor if you have existing health conditions or take medications.
The recommended timing for Vitamin D3 is With a fat-containing meal for absorption. Consistency matters more than exact timing for most supplements.
Important. Deficiency worsens during calorie restriction. Maintain 2000-5000 IU daily.
Important for overall health and optimal hormonal function during muscle building.
FitCommit calculates your exact macros and calorie targets from an AI body scan. Track food with camera scanning. Free 7-day trial.
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