Vitamin D3: Benefits, Dosage, and Best Supplements

Vitamin D3 supports bone health, immune function, and mood regulation. Many people are deficient, especially in winter or with limited sun exposure. Supplementation can help maintain optimal levels.

Most adults benefit from 1,000–2,000 IU daily; some need more based on blood levels. Vitamin D3 (cholecalciferol) is preferred over D2 for raising blood levels. Take with a meal containing fat for better absorption.

Look for third-party tested brands, D3 form, and a dose that fits your needs. Pairing with vitamin K2 may support bone and heart health. Always have your levels checked by a healthcare provider if you're unsure.