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Some especially good sources of vitamin B12 include: Liver: 3 oz
Benefits of B12 shots Vitamin B12 plays a foundational role in how your body produces energy, supports the nervous system, and maintains overall cellular health
A 2025 study in Neuroscience Letters found that chronic administration of BDNF-stimulating compounds in rodents led to receptor desensitization within 16 weeks, requiring progressively higher doses to maintain effect
Asthma and respiratory conditions pose particular risks, especially with inhaled forms
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