what happens if you inject too much b12 Vitamin B12: Risks, Symptoms and When to Seek Help – Bolt Pharmacy Feeling worse after B12 Injection:

How common is vitamin B-12 deficiency

People with low B12 levels often report: Excessive daytime sleepiness Fatigue despite adequate sleep duration Various neurological symptoms that may indirectly affect sleep quality Correcting B12 deficiency typically improves these symptoms over several weeks to months, as the body's stores are replenished and metabolic function normalises

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In the duodenum, pancreatic enzymes cleave B12 from R-proteins, allowing binding to intrinsic factor produced by gastric parietal cells

Regular B12 injections can be particularly beneficial for individuals who are unable to absorb vitamin B12 adequately from their diet or supplementsa challenge that may arise due to several medical conditions or lifestyle factors

They were referring to a study by the Federal Drug Authority in USA who looked at the effectiveness of old drugs,, some as old as thirty years and found them still as good as new.The NHS take a different view