**Vitamin D3** at 5,000 IU per capsule — right at the top of the clinically studied range (1,000–5,000 IU/day) for maintaining healthy blood levels and supporting bone density, immune function, and mood. The form is cholecalciferol (D3), which raises and sustains blood levels far more effectively than D2, and your body can absorb it directly without conversion.

This dose is especially relevant if you live in a northern climate, spend limited time outdoors, or have darker skin — all common risk factors for deficiency. Since vitamin D is fat-soluble, taking it with a meal that contains fat will meaningfully improve how much you absorb.

One thing to know: 5,000 IU sits above the official tolerable upper limit of 4,000 IU/day, though clinical consensus widely supports this dose for adults correcting or preventing deficiency. If you're taking it long-term, periodic blood testing (25-hydroxyvitamin D) is worth considering to confirm you're in the optimal range rather than overshooting.