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Most formulations of methylcobalamin injection contain benzyl alcohol as a preservative

But there are also some other signs unrelated to hair that may indicate a B12 shortfall: Fatigue, weakness and lack of energy Lightheadedness Pale skin Shortness of breath Heart palpitations Loss of appetite Numbness and tingling Cognitive changes like memory loss Depression Along with hair shedding, some other specific hair-related symptoms can signal low vitamin B12 levels: Thinning hair on the scalp or other body parts Dry, brittle hair prone to breaking Unusual hair texture - straight hair becoming curly or vice versa Faster graying of hair Changes to the hairline, like a widening part However, many factors beyond nutrient deficiency can also cause hair loss and premature graying

The duration of the effect of a B12 injection can vary

Every batch is analysed in-house by HPLC and mass spectrometry and ships with a Certificate of Analysis

It is a tolerance step rather than the dose expected to carry most weight loss