Pharmacogenetic ablation of GLP-1 neurons in the nucleus of the solitary tract (NTS) reduced the GLP-1 content of the spinal cord by almost 80%, indicating that brainstem neurons are the main, if not the only, source of GLP-1 in the spinal cord 9,20
However, understanding why these effects occur and how to manage them is essential for treatment adherence and patient wellbeing
The "gradual decline" group (approximately 40-50% of users) represents modal experience where benefits slowly regress toward pre-treatment baseline over 4-8 months, typically affecting users who completed shorter treatment courses (2-4 months), used lower concentrations or inconsistent application, possessed moderate to severe baseline skin damage requiring ongoing support, maintained adequate but not optimal complementary skincare, experienced significant lifestyle stressors affecting skin health including poor sleep or high stress, and faced genetic or age-related collagen production limitations
GLP-1 therapies work best when combined with lifestyle modifications