injectable b12 vs oral Injections Supplements: Which are more effective? Vitamin B12 Injection: Benefits, Uses

Ethics declarations Competing interests SJW is the founder of Ridgeline Therapeutics, HN is a paid employee of Ridgeline Therapeutics and, since manuscript submission, ADW has also become a paid employee of Ridgeline Therapeutics

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Limulus Amebocyte Lysate (LAL) testing detects bacterial endotoxins that cause immune reactions - even when the compound looks completely clean

If you are considering starting B12 supplements, particularly at high doses, discuss this with your GP or a registered pharmacist, especially if you have existing medical conditions or take other medications

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