HEALTHSTRONG SUPPORT
Vitamin D3
Only supplement if you're deficient. Then it matters a lot.
EFFECTIVE DOSE
1000–2000 IU/day typical; higher only under bloodwork guidance
HOW IT WORKS
Steroid hormone precursor involved in bone, immune, and muscle function.
WHAT THE EVIDENCE SUPPORTS
- Corrects deficiency (which is common)
- Supports bone & immune function
WHAT TO LOOK OUT FOR
- Get a blood test. Blind mega-dosing is not smart.
- Fat-soluble — take with a meal that has fat.
SIDE EFFECTS
- Toxicity possible at chronically high (>10,000 IU/day) doses
SOURCES
Reviewed 11/1/2025 · Brawn Supplement Reviewer
Educational content. Not medical advice. Talk to a licensed professional before starting any supplement, especially if you take medications or have a medical condition.