The recommended starting dose for methimazole is 2.5 mg/cat administered every 12 hours and is a daily, lifelong drug for hyperthyroid cats
Doing so can lead to a rebound effect, where your appetite and cravings return in full force, making it harder to maintain your weight loss progress
PMID 16527179
Choose a highly recommended and experienced dermatologist, discuss the options and your requirements with them and choose the way suggested by them
For example, someone on antidepressants or migraine medications might need a different weight loss plan than someone who is not taking those prescriptions
But the biological rationale is sound, the ingredient evidence is real, and adding a clean, single-ingredient 10g hydrolyzed collagen to your daily protein intake is a discussion-worthy nutritional option for appropriate adults, subject to your licensed healthcare provider's guidance