Supplement comparison results

Primary ingredients How we evaluate

We confirm content relative to daily recommended amounts (100 mg) and absorption efficiency, and focus on evaluating raw material sources (non-GMO corn-derived, DMS, Quali-C, PureWay-C, etc.). We also examine whether absorption-improving technology (liposomal, sustained-release) is applied.

Price How we evaluate

We calculate per-tablet or per-packet unit price to compare cost-effectiveness relative to ingredients. We focus on cost-effectiveness based on actual intake amount and absorption efficiency rather than simple retail price.

Brand How we evaluate

We comprehensively review GMP, cGMP, and HACCP certification status, raw material production location and manufacturer transparency, and global certification holdings. Vegan certification and capsule coating suitability are also included in brand reliability evaluation.

Quality How we evaluate

We multi-dimensionally evaluate raw material purity, antioxidant ingredient (e.g., vitamin E) use to prevent rancidity, and formulation stability. PTP+aluminum foil dual packaging to suit vitamin C's oxidation sensitivity and absorption technology application (liposomal/sustained-release) are included in quality items.

Additional ingredients How we evaluate

We verify inclusion of functional ingredients supporting vitamin C effectiveness (zinc, selenium, glutathione, vitamin D, bioflavonoids, amino acids, etc.) and supplementary components (fruit/vegetable extracts, rosehips, yeast extract, low-molecular fish collagen, etc.). We carefully evaluate synthetic additive presence and vegan compatibility.