Year-Round Daily Use; This Ester-C formula with citrus bioflavonoids is suitable for year-round use, but dosage can be increased during cold and flu season, or times of stress.

Immune Support & More; This antioxidant-rich Ester-C formula supports immune health and allergy relief, and helps maintain strong bones, gums, and teeth.

Well Retained; Clinical studies show that Ester-C increases vitamin C levels in the body for up to 24 hours.

Superior Absorption; Regular vitamin C is first buffered with calcium, then a special process transforms it into trademarked Ester-C. This vegan, non-GMO formula contains no dairy, gluten, or soy .

Gentle On The Stomach; Sisu Ester-C 600 mg is a less-acidic vitamin C that is gentle on the digestive system.

Each capsule contains
Medicinal ingredients
Vitamin C (calcium ascorbate)
from Ester-C® brand calcium ascorbate
600 mg
Calcium (calcium ascorbate)
72 mg
Citrus bioflavonoids
(lemon, grapefruit, orange, mandarin orange–fruit)
100 mg
Non-medicinal ingredients
magnesium stearate (vegetable)
Capsule shell
hypromellose
Adult dosage
Take 1–2 capsules daily or as directed by a health care practitioner
Contains no
Dairy, wheat, gluten, or soy