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Baik HW, Russell RM

however, there are no reports of chin spasms or twitching

However, if present with other symptoms, recurring mouth ulcers could be a symptom of vitamin B12 deficiency

The Br J Dermatol 158: 1299-1300

It is not intended for human or animal administration outside of a controlled research setting, and nothing in this article should be read as guidance for personal use, dosing, or self-administration

Tuna meal, which contains about 100 g of tuna, contains about 160% of the high nutritional value of vitamin B12