Unverified Preservative Concentration Generic vials rarely publish a tested benzyl alcohol concentration
NIH ODS
Heart rate : Modest increases in resting heart rate were observed in Phase 2 trials
Diet and exercise can help you lose weight and keep it off, but sometimes thats not enough
B12 Health Benefits - Relieve the body of fatigue and weakness, potentially improving stamina - Help prevent breast cancer - Prevent anemia - Treat sickle cell anemia and Alzheimer's disease - Maintain proper heart functioning - Maintain a strong nervous system B1 Health Benefits - Contributes to energy production - Rich in anti-aging properties - Reduces Alzheimer's diseases - Maintains a healthy heart - Improves memory and appetite - Prevents cataracts - Aids in the production of red blood cells B6 Health Benefits - Aids in maintaining healthy hormone levels ~ More information, precautions and interactions can be found under the "About B Vitamins tab." Before taking any new medication, either prescription or over-the-counter, check with your doctor or pharmacist

Side effects to tell your doctor about immediately are skin rashes, itching, hives, swelling of the tongue, lips, or face, blueish skin, chest tightness or pain, trouble breathing, wheezing, dizziness, or red, swollen, painful area on a leg (via the Cleveland Clinic)