Side-by-side comparison of mechanisms, dosing, interactions, and stacking potential.
| DHEA (Dehydroepiandrosterone) | Vitamin D3 | |
|---|---|---|
| Category | Supplements | Vitamins |
| Standard Dose | 25-50mg daily (men); 10-25mg daily (women) | 5000 IU daily (125 mcg) |
| Timing | Morning (mimics natural circadian peak). With food. | With largest fat-containing meal of the day (fat-soluble). Morning preferred. |
| Cycle Duration | Ongoing under supervision with regular blood monitoring (DHEA-S, testosterone, estradiol, PSA in men) | ongoing (lifelong for most people in northern latitudes) |
| Evidence Level | moderate_human | strong_human |
DHEA is the most abundant circulating steroid hormone, produced primarily by the adrenal zona reticularis. It serves as a precursor for both androgens (testosterone, DHT via 3beta-HSD and 17beta-HSD) and estrogens (estradiol, estrone via aromatase). DHEA-S (sulfated form) acts as a neurosteroid, positively modulating NMDA receptors and antagonizing GABA-A receptors (cognitive enhancement/alertness). It also modulates immune function (enhances Th1 immunity, IL-2 production), supports bone mineral density via estrogenic metabolites, enhances insulin sensitivity via PPAR-alpha activation, and opposes cortisol's catabolic effects (DHEA:cortisol ratio is a stress/aging biomarker).
25-50mg daily (men); 10-25mg daily (women)
Morning (mimics natural circadian peak). With food.
Ongoing under supervision with regular blood monitoring (DHEA-S, testosterone, estradiol, PSA in men)
Vitamin D3 (cholecalciferol) is hydroxylated in the liver to 25(OH)D (calcidiol), then in the kidneys to 1,25(OH)2D (calcitriol), the active hormone. Calcitriol binds the nuclear vitamin D receptor (VDR), forming a heterodimer with RXR that regulates >1000 genes. Key actions: upregulation of intestinal calcium/phosphorus absorption (TRPV6, calbindin), modulation of innate immunity (cathelicidin LL-37 antimicrobial peptide production), suppression of adaptive immune overactivation (Th1/Th17 to Treg shift), regulation of PTH and osteocalcin for bone mineralization, and modulation of insulin secretion from beta cells.
5000 IU daily (125 mcg)
With largest fat-containing meal of the day (fat-soluble). Morning preferred.
ongoing (lifelong for most people in northern latitudes)
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