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Possible adverse effects may include: Injection site reactions : Redness, swelling, irritation, or discomfort Gastrointestinal symptoms : Nausea, vomiting, stomach cramps, or diarrhea Headaches or dizziness Allergic reactions : Rash, itching, shortness of breath, or facial swelling (rare) Increased heart rate or anxiety (typically temporary from B-vitamins) Fatigue or weakness if used improperly Elevated liver enzymes when taken in excess particularly with methionine or choline Insomnia if taken late in the day due to increased energy levels Who should avoid or use caution
The most common symptoms include fatigue, pale or yellow skin, difficulty concentrating, headaches, gastrointestinal upset, depression, and numbness or tingling in the hands or feet
Though it differs a bit from one person to another, the effects of B12 vitamins usually last around 48 hours to 72 hours after the initial injection
But experimenting with a treatment youve seen online or on social media can take you down a potentially harmful pathor at least one that doesnt tackle the true issue
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