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The needle should be inserted at a 90-degree angle for most patients, though very thin individuals may need to use a 45-degree angle or pinch the skin to ensure subcutaneous rather than intramuscular injection
Several factors can influence how quickly youll experience benefits: Initial B12 Levels Those with severe deficiencies may notice more dramatic and rapid improvements compared to those with mild deficiencies
The second is dose and route translation : even where an effect is real in a mouse, the human-equivalent dose is not a simple body-weight scaling, and as the route section above stressed there is no human bioavailability figure to anchor an oral-versus-injected comparison
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