I am not a chemist but B12 does seem to be an inherently stable molecule, not least indicated by the fact that the boxes of it have long shelf from production dates on them
When it comes to needles I am a big chicken
Furthermore, there is strong evidence suggesting that lipofuscin (a photoreactive substance) is derived, at least in part, from oxidatively damaged photoreceptor outer segments (Drobek-Slowik 2007)

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