For hair , it is a reasonable add-on but not a first-line treatment
Furthermore, it has been found in humans and animals that nicotine enhances the learning ability (Poorthuis et al., 2009), improves neuronal plasticity in the hippocampus (Alkadhi, 2018), treats depression (Motaghinejad et al., 2016), and can treat excitotoxicity at low concentrations (Sieber, 2012)
Dermatologically tested for daily use
Material and Methods Reagents and Antibodies Dulbecco's Modified Eagle Medium (DMEM), DMEM/Nutrient Mixture F-12 (DMEM/F-12), Essential 8 and Neurobasal-A medium, Essentiel 8 Supplement, B-27 Supplement, fetal calf serum (FCS), trypsin, Glutamax, penicillin, streptomycin were from Gibco
Belding ME, Klebanoff SJ, Ray CG