Apply a small amount to your face and neck
R.et al (2010)
Administration Frequency: Liraglutide is administered once daily by subcutaneous injection, while semaglutide can be given once weekly by subcutaneous injection thanks to its considerably longer half-life of 6-8 days [30]
Oral high-dose B12 (1,000-2,000 g daily) may be considered as an alternative for patients with dietary deficiency without malabsorption who prefer this route or cannot tolerate injections
Controlled human trials exist, but they're limited in size, focused mostly on topical cosmetic use, and usually last only a few weeks or months. That means a lot of the exciting claims, especially around gene expression, systemic repair, and anti-aging effects, haven't been confirmed in large-scale human studies
My experience was very different