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These conditions can often be diagnosed based on your symptoms though if you feel your symptoms are chronic then i do encourage you to book an appointment for blood work with your GP as there is a chance that you may be suffering from an underlying condition such as pernicious anemia which could qualify you for free injections from the NHS

Patients with gastrointestinal disorders such as Crohns disease, celiac disease, or those who have undergone gastrointestinal surgeries (including gastric bypass) often experience impaired B12 absorption

Use every waking hour for 15 minutes for the first 24 hours

However, it's commonly discussed alongside injectable peptides because of its similar administration methods and its role in hormone optimization protocols