Dawson EB, Evans DR, Harris WA, Teter MC, McGanity WJ
The answer depends on the reason for the treatment
The limit for molecular area appears to be around 80 2 , and increases in size to greater than this seem to decrease BBB permeability dramatically
Consult a doctor before use if you have specific medical conditions
Per publicly available announcements, the FDA issued more than 50 warning letters to GLP-1 compounders and manufacturers in September 2025, followed by an additional 30 warning letters to telehealth firms in early 2026, targeting false or misleading marketing claims about compounded semaglutide and tirzepatide products
Employer cost controls intensify: 78% already impose prior authorizations or step therapy