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still feel tired after b12 injections Chronic Fatigue: Can Shots Make You Tired? · PA Relief Is it normal to feel
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However, it exhibits low cell membrane permeability and demonstrates substantial toxicity in animal models, thereby constraining its potential application as a therapeutic agent (Zweygarth et al., 1986)
Nishimoto, S., Tanaka, H., Okamoto, M., Okada, K., Murase, T., & Yoshikawa, H

The choice comes down to personal preference regarding convenience versus flexibility and cost

A deficiency in B12 can lead to a range of physical and neurological symptoms and may affect your overall wellbeing