This work was supported by the Medical Innovation and Development Project of Lanzhou University (lzuyxcx-2022-132), the Natural Science Foundation of Gansu Province of China (21JR7RA356), and the Science and Technology Program of Lanzhou (2022-ZD-93)
Try adding a small additional volume of bacteriostatic water to reduce concentration
And considering that this change of color, or oxidation, is a sign of the vitamin C no longer being viable, why would you want to waste your time and money on a useless DIY skin care product
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The formula also includes B vitamins and iodine, which contribute to normal psychological and cognitive function
Jiang Y, Wong JH, Fu M, Ng TB, Liu ZK, Wang CR et al (2011) Isolation of adenosine, iso-sinensetin and dimethylguanosine with antioxidant and HIV-1 protease inhibiting activities from fruiting bodies of Cordyceps militaris