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Gastrointestinal surgery can also affect B12 absorption
You're more likely to have vitamin B12 deficiency if you have a medical condition where your body can't absorb B12 or you follow a strict vegan diet
These may be due to defective DNA synthesis inhibiting replication in a site with a high turnover of cells
It is occasionally known to cause transient and mild adverse effects, such as [6]: Injection site irritation Nausea Fatigue Sweating Light-headedness To minimize the risk of adverse effects, researchers are advised to purchase peptides from legitimate suppliers and adhere to established clinical guidelines concerning proper handling
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