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Insufficient intrinsic factor production, common in older adults due to age-related absorption decline, can also lead to deficiency
This helps them decide whether this option is safe for them
5 Conclusion This systematic review and meta-analysis indicate that sublingual and oral vitamin B12 administration provide efficacy comparable to intramuscular injection in improving serum cobalamin levels and reducing hyperhomocysteinaemia
For those who are deficient, Vitamin B12 shots can provide a quick and effective solution
However, higher-quality studies are necessary to prove these links
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