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Description
Vitamin Deficiencies A lack of essential vitamins, particularly B12 or iron, may contribute to the darkening of skin around the mouth
Gentle swirling is acceptable if dissolution is incomplete after 5 minutes, but vigorous agitation damages peptide bonds
Macroscopic carbon nanotube assemblies: preparation, properties, and potential applications
doi: 10.1007/s11356-017-0624-8
