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The lab's identifier and test date are published on the Certificate of Analysis for that batch

Microbiome differences were greater between the two groups switched from WD to LD (i.e., WD/LD-V and WD/LD-T) and the two diet control groups (i.e., LD/LD-V and WD/WD-V) compared to the microbiome differences observed between the lean (LD/LD-V) and obese (WD/WD-V) control groups

The search terms used to obtain the literature for this review included groups of DAs, specific compounds, aquatic environments, and cross/co-resistance for antibiotic resistance genes (antimicrobial resistance or antibiotic resistance or antimicrobial susceptibility)

doi: 10.1172/jci67323 51 BelzbergMAlphonseMPBrownIWilliamsKAKhannaRHoBet al

That said, outside of certain sensitivities, allergies, or medical conditions, it's extremely difficult to take "too much" vitamin B12
