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Without enough vitamin B12, homocysteine can build up
Understanding this measurement is key because a heavy-handed pour of wine or a cocktail with multiple shots can easily count as two or more standard drinks, which is important to remember when you're tracking your intake
If the patient is given a 1mg tablet of B12 and absorbs 1% of it then he or she will be absorbing around 10mcg of the vitamin
Other reported effects include: Headaches and dizziness Nausea and gastrointestinal discomfort Allergic reactions to B12 formulations (rare) If you experience symptoms suggesting a severe allergic reaction (difficulty breathing, severe rash, swelling of face/throat), seek emergency medical attention immediately by calling 999 or attending A&E
An injection places B12 into muscle and bypasses the gut, so it works even if you absorb poorly
