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Facial lines fade because muscle movement diminishes as the nerves become restricted
A single-component research material supplied for controlled research environments
Reporting summary Further information on research design is available in the Nature Portfolio Reporting Summary linked to this article
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Serious side effects are rare, occurring in less than 1 percent of users
Intrinsic factor, Medline Plus, Vitamin B12, Fact Sheet for Consumers, National Institutes of Health, Office of Dietary Supplements, Vitamin B12, Fact Sheet for Health Professionals, National Institutes of Health, Office of Dietary Supplements Pawlak R
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