Collagen is mentioned constantly in aesthetic medicine and skincare marketing — but understanding what it actually does makes it much easier to understand why certain treatments work and others don’t.
Collagen is a structural protein that forms much of the skin’s inner scaffolding. It’s what gives young skin its bounce — that quality where it springs back quickly after being pressed.
Alongside elastin (which handles flexibility) and hyaluronic acid (which handles hydration), it makes up the dermis. The problem is that the body’s ability to produce collagen declines at a measurable rate from the mid-twenties onwards — roughly one percent per year.
By the time most people notice visible changes in their skin, that decline has been accumulating for ten or fifteen years.
What Causes Collagen Loss?
Sun exposure dramatically accelerates collagen breakdown. UV radiation generates free radicals that damage collagen fibres and suppress the skin’s production of new ones. Smoking does the same.
This is why the same person can look dramatically different in their fifties depending on lifetime sun exposure habits — genetics matters, but so does behaviour.
How Treatments Stimulate Collagen Production
The treatments that most reliably address collagen loss are those that stimulate the body to produce more of it.
Radiofrequency treatments like Thermage and Morpheus8 deliver controlled heat energy into the dermis, triggering a wound-healing response that produces new collagen over the months following treatment.
Microneedling achieves a similar effect through micro-injury. Ultrasound-based treatments like Ultherapy target the deeper foundational layers of tissue that other energy-based devices don’t reach.
Why Results Take Time
None of this happens overnight. The improvement from collagen-stimulating treatments peaks at around three to six months post-treatment because that’s how long it takes the skin to remodel.
Clinics offering skin treatments London that are worth visiting will tell you this upfront rather than overpromising immediate dramatic results.
Consistent, well-timed treatments deliver the most natural and long-lasting improvements.