If the active compound can penetrate the skin's outer barrier (the stratum corneum) and reach the dermis and subcutaneous tissue, it enters systemic circulation through dermal capillaries without going through your GI tract or liver
Trends Pharmacol Sci
Owing to these effects, liraglutide, a GLP-1 analog, has been studied as a potential drug for the treatment of pre-eclampsia, a pregnancy specific disorder, defined as new-onset hypertension after 20th week of gestation accompanied by proteinuria, as it is found to have anti-inflammatory and antioxidative effects (89)
Finding out this measurement will give you more information when selecting the length of your needle
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