That said, although side effects from vitamin B12 supplementation are very rare, it can possibly occur with B12 injections, but not with oral supplements
We did not observe associations even among patients with a history of psychiatric disorders, such as self-harm, suicidal ideation, and depression, the team concluded
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"In addition, these results highlight the need for further research to elucidate potential mechanistic links between GLP-1 receptor agonist therapy, weight loss, and hair loss, and to identify patient level risk factors that may increase susceptibility to hair loss." It's worth pointing out that the medical records the researchers were dealing with were limited in terms of measuring the severity and duration of the hair loss, and whether or not it was reversible