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However, larger peptides like growth hormone secretagogues achieve only 15 to 30 percent sublingual bioavailability, requiring significantly higher doses to approach injectable effectiveness

Prolyl isomerase Pin1-mediated conformational change and subnuclear focal accumulation of Runx2 Are crucial for fibroblast growth factor 2 (FGF2)-induced osteoblast differentiation

These were ex-vivo permeation experiments framed around anti-inflammatory delivery rather than wrinkle outcomes, so they speak to whether the molecule can reach the dermis, not to how much cosmetic change follows but even that limited, mechanism-level demonstration is one the injectable route has no equivalent of for reaching skin specifically

Toxins are stored in fatty tissues