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In addition, a deficiency of vitamin B12 can cause facial signs such as hyperpigmentation (dark spots), vitiligo (white patches where skin loses color), or angular stomatitis (inflammation at the corners of the mouth)

And the concentration is off because you added the wrong volume of water during reconstitution

Intramuscular injections bypass skin tissue that contains more immune cells, which can reduce reactions for some people

While both products are manufactured under strict pharmaceutical standards, their safety after opening depends heavily on how they are used in practice: Shelf Life After Opening One of the most important differences between the two solutions is how long they remain safe once opened