Intramuscular B12 injections bypass the digestive system for faster, more complete absorption than oral supplements, making them highly effective in treating deficiency and preventing complications like anemia, weakness, and neurological symptoms
Source: FDA Bulk Drug Substances Nominated for Use in Compounding under Section 503A, updated May 14, 2026
doi: 10.26402/jpp.2018.3.11
Common side effects such as nausea and reduced appetite can make it difficult to consume enough protein to preserve muscle strength
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Week 34: Weight loss typically becomes visible on the scale, ranging from 25 pounds depending on baseline metabolism and adherence to the medication schedule