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When it comes to vitamin C serums, a 25% concentration (this one comes in the form of tetrahexyldecyl ascorbate, a highly stable form of vitamin C that's in the same family of L-ascorbic acid) is probably the most I've tried in a product
Guerra C
"Recent Advances in Chromatographic Purification of L-Glutathione for Pharmaceutical Applications." Journal of Chromatography A, 1664, 462781.
doi: 10.1016/j.molmed.2023.04.004 56
Acknowledgments The authors extend their appreciation to the Deputy ship for Research & Innovation, Ministry of Education in Saudi Arabia for funding this research work through the project number ISP23-101
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