oral vs injectable l-carnitine l carnitine injection Differential effects of and intravenous l- carnitine on serum lipids: is the microbiota the answer? vs oral Injectable – l carnitine oral vs injection

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What is GHK-Cu researched for

Upregulation of UBR1 m6A methylation by METTL14 inhibits autophagy in spinal cord injury

And to get back to the point here, the original poster mentions a low B12 level and receiving treatment for same, but not taking any additional B vitamins so the simplest explanation here is that they are experiencing neurological damage from B12 deficiency, rather than anything to do with B6

Importance of High-Quality Glutathione Supplements Because the Food and Drug Administration (FDA) does not regulate dietary supplements as strictly as prescription medications, there can be significant differences in the purity, potency, and safety of glutathione supplements on the market