Retatrutide side effects are getting plenty of attention, and so is the weight loss. In phase 3 trials, people on the highest dose lost an average of 28.3% of their body weight over 80 weeks. That’s a big number. But skin doesn’t read trial results, and it can’t always keep pace with a body changing this fast. If you’re on a weight loss injection or thinking about one, here’s what to expect from your skin and muscles along the way.
Key Takeaways
- Retatrutide is still investigational and isn’t approved by the TGA. Semaglutide and tirzepatide users already face the same skin and body questions.
- Rapid fat loss can leave skin looser, face hollower, and muscle depleted, even when the scale result is brilliant.
- Among retatrutide side effects, skin sensations such as tingling or burning top the list in trials.
- HIFU, TeslaFormer and SQT Bio-Microneedling can support your skin and muscle alongside your medication.
- Planning early gives you more options than playing catch-up later.
What is Retatrutide?
Retatrutide is an investigational once-weekly injection that acts on three hormone receptors: GIP, GLP-1 and glucagon. Semaglutide acts on one and tirzepatide on two, which helps explain why retatrutide’s results are bigger. In Australia, retatrutide isn’t approved as a medicine by the TGA, so any decision about weight-loss medication should be made with your GP or prescribing doctor.
At Body Catalyst, we’re here to support your skin if you’re on this path.
Retatrutide Side Effects: What Happens to Skin?
Most retatrutide side effects are digestive: nausea, diarrhoea, constipation and vomiting. The skin-related one researchers flagged is dysesthesia, an unusual sensation such as tingling, burning or heightened sensitivity to touch. In the TRIUMPH-1 trial, it affected 12.5% of people on 12 mg, compared with 0.9% on placebo, and was generally mild to moderate.
The retatrutide side effects on the skin include dryness, sensitivity, rashes and hair thinning. Those reports are anecdotal, and rapid weight loss on any medication can affect skin and hair. If you notice changes, tell your doctor.
Why Does the Skin Struggle to Keep Up?
Collagen and elastin give skin its bounce and shape. When fat volume drops quickly, skin has to shrink to fit, and collagen remodelling takes months. Add the natural slowdown in collagen and elasticity with age, and the result can be softer, looser skin on the tummy, arms, thighs and face.
Looser skin isn’t on the retatrutide side effects list yet, but larger, faster weight loss may make it more noticeable. Trials haven’t measured skin laxity, so treat this as a reasonable expectation while the data catches up.
Loose skin and dimpled areas often turn up together once fat is reduced. Our guide on how to tighten loose skin after weight loss covers the non-surgical options and how cellulite treatments can smooth the texture that becomes more visible with rapid weight change.
What is Ozempic Face?
Ozempic face is the hollow, drawn look some people notice after significant weight loss on GLP-1 medications. Your face has small fat pads in the cheeks, temples and under the eyes that keep it looking full and lifted. When they shrink, cheeks flatten, and jowls soften, it can leave you looking older than you feel, even when your health markers are improving.
It’s simply what happens when fat leaves the face along with the rest of the body. A HIFU facial can help here by using focused ultrasound energy to stimulate collagen and tighten the deeper layers of the skin, supporting a firmer, more lifted look.
What About Muscle Loss?
Weight lost on injections isn’t all fat. In a SURMOUNT-1 body composition analysis of tirzepatide, roughly 75% of the weight lost was fat, and 25% was lean mass. More weight loss means more muscle at stake, which affects strength, posture and how firm your body looks. Skin sits over muscle, so when both shrink, the looseness is easier to see.
Protein and resistance training are your foundations. The TeslaFormer adds support by triggering intense muscle contractions, which can help build strength and tone through the tummy, glutes and thighs.
Which Treatments Support Skin and Body?
Every plan is personalised, but these are the treatments we most often combine for people on weight loss injections:
- HIFU uses focused ultrasound to stimulate collagen in the deeper layers of skin. It lifts and tightens the face and neck, and it’s a good fit for softer jawlines, jowls and looseness through the tummy.
- Notox is our needle-free facial method that combines HIFU, massage, and skincare. The QuickLift targets areas like the cheeks, jawline and neck, which suit the hollowing and sagging people notice after significant weight loss.
- Radiofrequency is part of our treatments for tightening skin. It warms the deeper layers to encourage collagen production and firm skin on the tummy, arms and thighs.
- SQT Bio-Microneedling uses natural spongilla spicules to create millions of micro-channels, boosting cell turnover and collagen production. There’s no heat and minimal downtime, which suits skin that looks dry, dull or textured.
- TeslaFormer uses functional magnetic stimulation to trigger strong muscle contractions, like a localised workout. It supports strength, tone, and definition in the tummy, glutes, and arms.
- Cellulite treatments target the dimpled texture that becomes more visible as fat is reduced.
Results vary, and we’ll tailor your plan to your goals, timing and where you are with your medication.
Why Plan Before the Weight Drops?
Most people on weight loss injections watch the scale. Skin catches up later, and the fix then has more ground to cover. Starting early means we can support collagen and muscle as your body changes, which gives you more options than waiting until the change has already happened.
Taking semaglutide or tirzepatide, or wondering what’s next? Book a consultation with the Body Catalyst team, and we’ll map out a skin and body plan around your goals, including the retatrutide side effects on skin if you go down that path in future.
We don’t prescribe or supply weight-loss medication, as that is handled by your doctor. Our focus is your skin and body.
