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Food Sci Nutr 1321:7488590 Javaheri-Ghezeldizaj F, Alizadeh AM, Dehghan P, Dolatabadi JEN (2023) Pharmacokinetic and toxicological overview of propylgallate food additive

Yes, certain small peptides can cross the blood-brain barrier, the protective filter that controls what enters brain tissue, which lets them act directly on the nervous system

doi: 10.1007/BF00047834

B12 is a vitamin responsible for maintaining healthy nerve and blood cells