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For B12, the length is the part that does the real work
However, you are at increased risk of vitamin B12 deficiency if any of the following applies: You're age 50 or older
Good quality oral Methylcobalamin supplements, free from fillers, binders and additional additives are available to purchase for approximately 10 for a 30 day supply from reputable companies
New York: Springer-Verlag
Use needles of shorter length (4 mm or the shortest available) and smaller diameter (highest gauge number), and the tip with the lowest penetration force to minimize pain
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