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Heres why shots work better: They skip the digestive system They release from the muscle They have a stronger effect on red blood cell production They provide better support for brain and nerve health Better retention is seen in people with a deficiency How to Tell If Your B12 Shot Is Wearing Off Recognizing when your shot is losing its effect can help you plan your next dose on time
Packer M, Zile MR, Kramer CM, et al
Synthesis and secretion of melatonin increases during the dark period of the day and is maintained at a low level during daylight hours
doi:10.1056/NEJM198806303182604
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