glutathione and methyl folate donor supplementation reduces phospho‐Tau, Fyn demethylated protein phosphatase 2A levels and mitigates learning and motor deficits in a mouse model of tauopathy - Hummel - 2023 Methylated Folate

Injected vitamins are more effective than pill form supplements because they enter directly into the bloodstream, as opposed to first traveling through the digestive tract, then being absorbed into the bloodstream where they lose some of their potency

Collagen remodeling takes time

The neuroprotective mechanisms may involve modulation of inflammatory responses within the central nervous system, promotion of neuronal survival, and enhancement of axonal regeneration and synaptic plasticity

Both methods can help increase your B12 levels, but they differ significantly in delivery and how quickly you experience the benefits