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Subcutaneous administration near the injury site provides both high local concentration and some systemic distribution as the peptide migrates to areas of damage throughout the body

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Curr Pharm Des 2011

Otsu, N

van Nuland AJM, den Ouden HEM, Zach H, Dirkx MFM, van Asten JJA, Scheenen TWJ, Toni I, Cools R, Helmich RC (2020) GABAergic changes in the thalamocortical circuit in Parkinsons disease

I do think there's a lack of really good solid evidence in humans, but that might only be because it's just not studied enough, and that's usually the case