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Keep in mind that the best option depends on the underlying cause of the deficiency and your healthcare provider's recommendations

Shibata N, Kunisawa J, Hosomi K et al (2018) Lymphoid tissue-resident Alcaligenes LPS induces IgA production without excessive inflammatory responses via weak TLR4 agonist activity

Fitness influencers credit it with healing injuries, podcaster Joe Rogan has endorsed it, and actor Jeremy Renner said it helped him recover from a near-fatal accident

Although the vein could be the most efficient method of achieving results, injecting vitamin B12 into the muscle could let it stay longer in your system