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Many people have a dietary B12 deficiency, as it is only prevalent in red meats, organ meats like liver, and eggs
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The FDA's 2024 review found no published human pharmacokinetic study that formally characterized the subcutaneous route, so these amounts are anecdotal rather than an approved clinical protocol
Many older adults do not eat sufficient animal products to meet B12 requirements, often due to dental issues and reduced appetite
Regular blood tests help us see if the current dose is right
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