DHEA vs Vitamin D3 (+ K2)
Both are used for bone health. Here's how they compare on human evidence, mechanism, safety and availability — in plain English.
| DHEA | Vitamin D3 (+ K2) | |
|---|---|---|
| Human evidence | ★★★☆☆ | ★★★★★ |
| Legal status | OTC Supplement, Prescription | OTC Supplement, Prescription |
| How it works | Adrenal precursor upstream of both testosterone and estradiol; declines ~80% by age 70. Supplementation raises downstream hormones mainly in older adults and women. | Cholecalciferol → 25(OH)D (liver) → 1,25(OH)₂D (kidney), which binds the VDR (vitamin D receptor), a nuclear transcription factor regulating 200+ genes including those for calcium transport, immune peptides, and testosterone synthesis. K2… |
| In plain English | A raw material your body turns into sex hormones. Refilling it helps older people whose levels crashed; does little for young men who already have plenty. | A hormone your skin makes from sunlight that switches on hundreds of genes. Indoor life (very common in Singapore) leaves most people deficient, which quietly lowers testosterone, immunity, and mood. |
| Bottom line | For the 50+ with low DHEA-S, not young athletes. | Highest-value fix if you work indoors. Almost everyone benefits. |
| Availability | Prescription only | Prescription only |
Which is better for bone health?
Vitamin D3 (+ K2) has the stronger human-evidence rating (★★★★★ vs ★★★☆☆), but the right choice still depends on your goal, tolerance and budget.
Full breakdowns: DHEA · Vitamin D3 (+ K2).
Common questions
Is DHEA or Vitamin D3 (+ K2) better for bone health?
Vitamin D3 (+ K2) has the stronger human-evidence rating (★★★★★ vs ★★★☆☆), but the right choice still depends on your goal, tolerance and budget.
What's the difference between DHEA and Vitamin D3 (+ K2)?
DHEA: For the 50+ with low DHEA-S, not young athletes. — Vitamin D3 (+ K2): Highest-value fix if you work indoors. Almost everyone benefits.