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Diagnosed Deficiency or Malabsorption if you have a confirmed deficiency in a vitamin that affects appetite (like B1, zinc, or iron) or a condition that impairs nutrient absorption (such as certain digestive disorders or post-surgical states), vitamin injections can be highly beneficial

Lan H, Su Y, Liu Y, Deng C, Wang J, Chen T, et al

Personalized wellness resources in myWellmark myWellmark makes it easy for all employees of fully-insured groups to set wellness goals and track their progress over time

2015;39:S23S35

It is important not to self-treat with high-dose B12 supplements before seeing your GP if you suspect deficiency, as this can interfere with diagnostic blood tests and potentially mask underlying conditions such as pernicious anaemia