Comparison
Vitamin D3 vs B-Complex
Vitamin D3
Hormone-like vitamin synthesized in skin from UVB. Profoundly involved in brain function, mood, and inflammation.
B-Complex
B vitamins (B1, B2, B3, B5, B6, B7, B9, B12) are cofactors in nearly all neurotransmitter synthesis. Deficiency causes cognitive and mood symptoms.
| Field | Vitamin D3 | B-Complex |
|---|---|---|
| Category | vitamin | vitamin |
| Dose range | 0.025–0.125mg | 50–150mg |
| Half-life | 360h | — |
| Onset | — | — |
| Evidence | EVIDENCEA | EVIDENCEA |
| Safety | ●●●●● | ●●●●● |
| Legal (US) | USOTC | USOTC |
| PubMed refs | 9200 | 8000 |
The comparison in plain English
Auto-generated from dataVitamin D3 and B-Complex are both in the vitamin category respectively. Vitamin D3 Hormone-like vitamin synthesized in skin from UVB. B-Complex B vitamins (B1, B2, B3, B5, B6, B7, B9, B12) are cofactors in nearly all neurotransmitter synthesis.
Bottom line
Vitamin D3 (evidence A, safety 5/5) matches the evidence base of B-Complex (evidence A, safety 5/5). Vitamin D3 has the slightly cleaner safety profile. For users new to either, the higher-evidence option is the safer first try.
Choose Vitamin D3 if
Vitamin D3 is the better fit when your goal aligns with its mechanism (Vitamin D3 (cholecalciferol) is converted to 25-hydroxyvitamin D in the liver and then to the active hormone 1,25-dihydroxyvitamin D (calcitriol) in the kidneys) and the dose range (0.025–0.125mg) suits your protocol. Half-life is 360h.
Choose B-Complex if
B-Complex is the better fit when your goal aligns with its mechanism (Each B vitamin serves as a cofactor in distinct biochemical pathways) and the dose range (50–150mg) suits your protocol. Half-life is —h.