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Deficiency in vitamin B12 may cause anemia, fatigue, muscle weakness, intestinal problems, nerve damage, and mood disturbances
Particularly important for peripheral nerve fibers innervating eye including corneal nerves
Likewise, using insulin while your blood sugar is too low is also problematic because your blood sugar will just continue to drop
Community reports sometimes describe injectable GHK-Cu as contributing to hair improvements alongside skin and healing benefits, but these are self-reported observations without controlled conditions
It's a less severe concern than, say, copper toxicity, but it's a practical safety issue that must be considered