While this approach is sometimes used clinically, it is considered off-label and should only be done under the guidance of a licensed medical provider
Concerning the role of GLP-1 on glucose uptake and glucose transport, it has been demonstrated that in fully differentiated 3T3-L1 adipocytes, GLP-1 increases insulin-stimulated glucose uptake and the protein levels of GLUT-1 and GLUT-4 (27)
doi:10.1007/s12325-011-0044-y 155
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Willow compounded sublingual tablets use a different formulation, and the bioavailability (how much drug actually enters your bloodstream) may differ from both the injectable and the FDA-approved oral versions