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If comparative studies are scheduled over multiple weeks, align handling parameters (light protection, temperature, container type) so that any observed differences reflect the experimental variables rather than variability in preparation

Syringe dead space: Standard syringes leave a small amount of solution in the needle hub after each injection

Lack of intrinsic factor is most common in older people and is usually associated with an autoimmune disease known as pernicious anaemia

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Getting a shot that contains B vitamins too late in the day may promote insomnia that night + possibly even vivid dreams