When levels are low, it can lead to persistent fatigue, weakness, and lack of motivation
Benzyl alcohol is added as a preservative to help inhibit bacterial growth and allow multi-use handling.
Hypersensitivity
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If you are experiencing any of these symptoms without a clear reason then checking your vitamin B12 levels would be the next appropriate step: How to check for Vitamin B12 Levels Its important to realize that some medical conditions are not appreciated and not taken as seriously as others
[DOI] [PMC free article] [PubMed] [Google Scholar] 114.Rosenbloom M., Barclay T.R., Kashyap B., Hage L., OKeefe L.R., Svitak A., Pyle M., Frey W., Hanson L.R