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When I inject b12 it is painless mostly but when I inject b2 it hurts especially when I do it fast so I have to do it slowly and it is SUBQ or IM. IV is painless beside the initial hit into the vein especially if it is a core of multiple veins previously damaged etc.
I think the pain comes from in the skin were it activates P2X receptors expressed on nociceptive neurons and causes the pain. It hurts more on the shoulder than on the ass ...
I think the pain comes from in the skin were it activates P2X receptors expressed on nociceptive neurons and causes the pain. It hurts more on the shoulder than on the ass ...
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