For immune support and antioxidant defense, this gives you a strong dose — 1,000 mg of **Vitamin C** per capsule, and the label suggests two daily for 2,000 mg total, right at the top of the clinical range. Even one capsule puts you at a fully effective level. The formula also includes 200 mg of **citrus bioflavonoids**, which may support absorption.

Ester-C is marketed as a gentler, better-absorbed form of vitamin C, but the research behind those claims is limited. Independent studies haven't shown a clear advantage in terms of blood levels or health outcomes, so the premium you're paying for the Ester-C form may not translate into better results for you.

The capsules use gelatin, so they're not suitable if you follow a vegetarian or vegan diet. At the full two-capsule dose, you're at the 2,000 mg tolerable upper limit — generally safe, but worth knowing if you also get vitamin C from other sources throughout the day.