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That basically means it is less likely to wipe out your gut flora to the extent that other antibiotics like Neomycin might
Nat Rev Drug Discovery 20:309325 Narita Y, Arakawa Y, Yamasaki F, Nishikawa R, Aoki T, Kanamori M, Nagane M, Kumabe T, Hirose Y et al (2019) A randomized, double-blind, phase III trial of personalized peptide vaccination for recurrent glioblastoma
And since the nutrient is water soluble, you cant take in too much