Ester c174 plus is exclusively formulated by solgar174 and provides a patented method of supplementing ph neutral non acidic vitamin c in addition ester c174 plus contains the vitamin c metabolites that occur along with vitamin c in nature a special manufacturing process is employed to form a unique calcium ascorbate metabolite complex solgar174 ester c174 plus offers the addition of providing acerola citrus bioflavonoid complex rutin and rose hips free of glute