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bpc-157 peptide function & The Gut-Brain Axis: A Practitioner's Definitive Review of the Evidence BPC-157 Peptide Therapy | Doctors
Description
However, a few limited studies have raised concerns about the possible side effects of taking vitamin B12: A 2019 study found that taking more than 25 micrograms (mcg) per day or higher was associated with an increased risk of bone fractures in postmenopausal women

More serious side effects are rare but can occur

Thus, the complexity of the actions of some drugs can reveal their connection with the role of neurotransmitters [12,13,14]

Your body can't make B12 on its own
