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The choice depends on several factors, such as the injection dose, frequency, and medical equipment
The shoulder Experienced doctors commonly administer B12 injections into the upper arm area by inserting the injection into the deltoid (shoulder) muscle
For example, you shouldn't use this medication if you're allergic to cyanocobalamin or cobalt, or if you have Lebers disease, which is an inherited form of vision loss
She writes here on the treatments CoLaz delivers across its seven UK clinics
27 May 2026 8 min What do IV vitamin drips actually do for you
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