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[ekaitz]

This study suggest formation of hydrogen peroxide from that combination,

 

"Hydrogen peroxide and hydroxyl radical formation by methylene blue in the presence of ascorbic acid"

 

 

[Turnbuckle]

The concern is primarily with ascorbic acid in the retina, where oxygen, light, and other antioxidants can interact with it. But dosage, while within the range that people use, is relatively high. 

 

there is a narrow range of concentrations and exposure times where ascorbate exerts photoprotective effects, exceeding which leads to ascorbate-mediated increase in photocytotoxicity. 

https://www.ncbi.nlm...pubmed/22924673

 

 

So one might want to avoid large doses of C before going out to the beach.