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In the case of IV administration, the entire dose reaches the systemic circulation and an immediate physiological response can be achieved, whereas IM and SC administrations involve an absorption process from the injection site, which leads to a delayed response, since drug molecules have to diffuse in the interstitial space in order to reach the capillaries (i.e., to be absorbed)

In these cases, a cortisone injection for Mortons neuroma effectively reduces pain

But protein alone cant do it all, and the research shows that other nutrients, like vitamin B12, may matter too

What Does the Science Say About Vitamin B12 and Hair Loss