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Commercial serums offer 12-24 months unopened shelf life with professional preservative systems and 6-12 months post-opening depending on packaging (airless pump best), while DIY serums last only 1-2 weeks refrigerated without professional preservatives

10.1016/j.regpep.2009.11.012 95 TurkovicB.SikiricP.SeiwerthS.MiseS.AnicT.PetekM.et al (2004)

Vitamin B12 deficiency and cognitive impairment: A comprehensive review

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Current research indicates that neurotrophic factor pathway modulation serves as the primary driver of its therapeutic effects, supported by at least four additional mechanisms that work synergistically to promote neuronal survival, plasticity, and functional recovery

The tryptophan residue at the N-terminus gives it a characteristic UV absorbance profile used for laboratory identification