does sublingual b12 work as well as injections

https://www.eliteresearchlab.com/wp-content/uploads/2026/04/box-bottle-45-scaled.png FitishRX Treatment:3 Months Rather than directly supplying NAD+ precursors (like NMN or NR), it works by blocking an enzyme that consumes nicotinamide, theoretically preserving the substrate pool for endogenous NAD+ production Efficacy of different routes of vitamin B12 supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis | Irish Journal of Medical Science (1971 -)

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