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There has not been a UL (upper intake level) established for B12 because it is not stored in your body and therefore, can not build up enough to cause serious adverse side effects for most people
Vitamin B12 use while breastfeeding
Medically reviewed by Faisal Shafiq (Superintendent Pharmacist, GPhC registration number 2067224)
What is the recommended needle size for subcutaneous B12 injections
Industry average runs 5% to 10%
Molecular weight (~340 Da free tripeptide) permits transdermal delivery for surface-adjacent tendon research applications
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