Because of this, some research protocols may prefer: 3ml syringes for higher-volume administration protocols Slightly larger gauge needles to improve drawing and administration flow Commonly Used Research Needle Sizes 25G27G needles are commonly used in certain research settings Higher-volume protocols may draw more easily with slightly larger gauge needles compared with standard insulin syringes Administration Research Contexts Research protocols commonly investigate: Subcutaneous administration Intramuscular administration depending on: Research design Volume administered Experimental protocol structure Experimental protocol preference Higher-volume Glutathione research protocols are commonly investigated using intramuscular administration in certain research contexts due to the increased solution volume compared with many peptide formulations

Fergie Martnez, MD, Chief of Regenerative Medicine at Longevity Medical Institute in Los Cabos, Mexico, who has advanced training in peptide therapies, bioidentical hormones and sexual health
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Intravenous use can be very effective, and doesn't cause diarrhea by this route, but this agent must be given extremely carefully, since an error in dosing can shut down the bone marrows production of blood cells, and potentially be fatal
Lancet 352 , 19781981 (1998)