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Contraindications include: Sulfa allergy, due to potential sensitivity to methionine derivatives

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B12 Deficiency and Dermatological Symptoms Patients with a vitamin B12 deficiency may notice dermatological symptoms such as hyperpigmentation, vitiligo, or dry, irritated skin

Watch for any unusual symptoms such as persistent fatigue, swelling, or allergic reactions

coli bacteria and worms, and both obtain vitamin B12 exclusively from the tryptone in the agar plates 16

Nevertheless, the methyl group is of enormous importance for many bodily processes and plays a central role in many metabolic processes , as we will demonstrate in the following