Not sure which BPC-157 protocol fits your goal
Parasutterella colonization has been shown to alter tryptophan, tyrosine, and xanthine metabolism in mouse cecal samples 61
Metyas SK, Yeter K, Solyman J, Arkfeld D
It's also been studied for alcohol-related gastric damage and inflammatory bowel disease models
High-dose oral b12 protocols Oral b12 can overcome absorption issues through mass action
[4] Pharmacokinetics and Distribution Pharmacokinetic work in mice reported systemic exposure and distribution of 5-Amino-1MQ to metabolically active tissues, including adipose, muscle, and liver, after subcutaneous compound application