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Description
A vitamin B12 deficiency can often lead to a feeling of extreme tiredness, lack of energy and muscle weakness alongside many other symptoms

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Some are pharmaceutical

doi:10.1007/s00441-019-03016-8 [2] Deek SA

[ Links ] Gaberc-Porekar, V., Zore, I., Podobnik, B

Among its numerous health-promoting properties, vitamin C is an essential vitamin that supports the immune system and is also a potent antioxidant
