4. A vitamin precursor that the body converts to its active form through normal metabolic processes. Carotene for example is a provitamin of vitamin a.
5. Sorbitol and provitamin B5 have intensive moisturizing properties and also protect the extremely fine skin around the eyes area from further moisture loss.
山梨醇和维生素原b 5密集保湿的属性，同时保护进一步的水分流失的眼睛周围的皮肤极其精细的。
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6. Sorbitol and provitamin B5 have intensive moisturizing properties and also protect the extremely fine skin around the eyes area from further moisture loss.
