Lose the fat.
Keep the muscle.
On a GLP-1, up to 40% of the weight you lose can be muscle, not fat. Bion's Fat Loss Score tells you if you're losing the right kind, and exactly what to change if you're not.
Built for people on Ozempic, Wegovy, Mounjaro, and Zepbound who train to protect the muscle underneath.
- Weight trend
- Waist
- Body fat
- Strength held
- Lean mass
The fat comes off.
So can the muscle.
GLP-1s work. But fast weight loss without enough protein and training takes muscle with the fat, and muscle is what keeps you strong, keeps the weight off, and keeps your metabolism up. Judging it by the scale alone hides exactly the thing you should watch.
One number for
the only question.
Your Fat Loss Score answers one thing: are you losing the right kind of weight? It reads how much muscle you're keeping while the fat comes off, measured against your own normal. Do more, hit your protein, push a set, and the number goes up. A low score isn't failing; it just means there's room to climb, and we show you how.
See your dose,
day by day.
Bion keeps your whole dose history, rotates your injection sites, and nudges you before your next shot. It shows how much medication is still in your system on any given day, grounded in published research, so a heavy or a flat day makes sense.
Three taps a day.
One number that matters.
Log your dose in seconds
Your shot, your protein, your weight, your workouts. All in one app. Rotate injection sites and get a nudge before your next dose.
Bion checks your muscle
It reads your weight and your strength together, against your own normal, so it can tell fat loss from muscle loss. Most GLP-1 apps never check this.
Keep what you worked for
Your Fat Loss Score says if you're losing the right kind of weight, and the next lever to pull: protein, a set, a walk. Watch it climb.
“Bion keeps everything in one place and tells me exactly what to connect. I've lost 20 lbs (9 kg) so far, and bodyweight workouts feel so much easier now. I really think I got stronger.”★★★★★ · App Store rating
Lose the fat. Keep the muscle.
See if it's working, and exactly what to do next. Free to start.