I've been on 12 for a couple months now.
Took about 6 weeks to kick in...and when it does, it kicks in hard. I haven't been hungry on Reta since second week of 4 mg.
I wear a CGM now bc I went hypoglycemic when on Ozempic originally earlier this year (<30 glucose).
Context for rest of post: 1200 calories per day max, high protein low carb diet, supplementing with multivitamins, blood tests every few weeks to confirm everything is going perfectly.
Semaglutide experience: okay, hunger would come back end of every week, insane constipation + burping + acid reflux. HRV absolutely tanked, but stayed on it until hitting 1.7. Lost ~1/ lbs per week. Fatigued like crazy.
Tirzepatide: great, burping continued, but other side effects were mildly existent...laxatives + electrolytes made everything better. Titrated up to 10 mg, was losing 1.5 lbs/week.
Retatrutide: excellent, all side effects have gone away aside from burping. I do wake up middle of the night needing to chug water and am needing to drink electrolytes multiple times per day. On 12 mg dose, losing ~3.5 lbs/week. I am 20 lbs from my goal weight right now and normal weight range, losing weight hasn't slowed though.
Fatigued lasted a couple weeks on Reta, until I started to eat way more protein.