que es bpc-157 en español – Research Peptide BPC-157: ¿Para qué se usa?,

C.SunY.et al (2018)

[37] Potential side effects of lipotropic injections include: Pain or soreness at the site of injection Diarrhea Constipation Anxiety Increased heart rate Incontinence Insomnia Dry mouth Fatigue Numbness of hands and feet This is not a comprehensive list of adverse effects

That should give you a better understanding of what causes B12 side effects

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