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
Doctors sometimes recommend a very low-calorie diet (under 1,000 calories per day) if someone is obese and has a medical condition, such as high blood pressure, but these diets must be carefully supervised by a doctor
Within a couple days after receiving B12 injections, patients often report an increase in their energy and stamina levels
The key takeaway is that the wrong amount of bac water, whether too much or too little, will compromise the integrity of your experiment
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