Ester-C Plus Vitamin C is a dietary supplement that supports immune health with a gentle, gut friendly calcium ascorbate blend. Each capsule combines Ester-C calcium ascorbate with citrus bioflavonoids, acerola extract, rose hips and rutin to help support immune function. Dr. Hemilä of the University of Helsinki notes Ester-C increases vitamin C in leukocytes for up to 24 hours. Solgar has a long standing commitment to quality and uses kosher certified production. Available Sizes & Variants: 100 capsules – daily immune support in easy to take capsules. Benefits & Features: Gentle immune support with a gut friendly vitamin C blend. Active ingredients work together to keep higher vitamin C levels in white blood cells for 24 hours, supporting immune defence while staying easy on the gut. Citrus bioflavonoids, acerola, rose hips and rutin work together to boost absorption and antioxidant effect. Designed for daily use as part of a balanced wellness routine alongside a vitamin d supplement or probiotics for broader immune support. Kosher certification underlines Solgar's commitment to quality and transparent production standards. Solgar Ester-C Plus Vitamin C embodies a long standing commitment to quality and transparency. The formula comes in vegetable cellulose capsules, free from gluten, wheat, yeast, sugar, salt and artificial colours, and carries a kosher certification from KOF-K (#K-1250). This care for sourcing and production mirrors Solgar’s heritage in premium, plant-based wellness, making it a trusted staple in many customers' daily routines.