- Australian radiation oncology guidelines consistently recommend fragrance-free, pH-balanced moisturisers during and after treatment
- Radiation damages the sebaceous glands that produce the skin's own oils, which is a different problem from ordinary dryness
- Most moisturisers are designed to hold water in the skin, not replenish the oils the skin has stopped producing
- Apply moisturiser at least two hours before each session so skin is clean and dry for treatment
- Macadamia oil contains 17-22% omega-7 (palmitoleic acid), the same fatty acid the skin's sebaceous glands produce naturally
Radiation does something specific to skin that most moisturisers were not designed for.
The question I hear most often from people going through treatment is some version of "I am already moisturising twice a day, so why is my skin still getting worse?" The answer matters, because it changes what you reach for.
What radiation actually does to the skin
Radiation does not just dry out the surface. It damages the sebaceous glands in the treatment field. These are the small glands responsible for producing the skin's own oils, specifically a fatty acid called palmitoleic acid (omega-7) that forms the structural part of the skin barrier.
When those glands are damaged, the skin loses its ability to produce that oil. Applying a water-based moisturiser on top of skin that has stopped producing oil is like filling a cracked vessel with water. The water evaporates. The cracks remain.
This is why standard moisturisers feel like they are working at the moment of application but the skin returns to the same state within hours. The surface is temporarily softened, but the underlying barrier is still depleted.
What Australian guidelines actually say
Current Australian guidelines from bodies including MASCC, the Alberta Health Services (updated March 2026), and the eviQ cancer treatment resource all point in the same direction: use a fragrance-free, pH-balanced moisturiser, applied consistently, at least twice daily.
Fragrance-free is not optional. The treatment field is acutely sensitised and many fragrances, including those in products that seem gentle or natural, can trigger reactions on radiation-affected skin. This is not a preference. It is a clinical requirement across all current guidelines.
The guidelines are less specific about the type of moisturiser because most clinical guidance does not distinguish between water-based and lipid-based formulations. That distinction matters for how well a product works, even if the guidelines do not yet reflect it.
What to look for in a moisturiser for radiotherapy
The products most commonly recommended in Australian cancer centres are simple, unfragranced, and readily available. Sorbolene is the default. It passes the fragrance-free test. Many patients find it comfortable during mild skin reactions.
For skin that is significantly drier or more reactive, the limitation of sorbolene-style products is that they replace water, not oil. If the sebaceous glands are damaged, what the skin is actually missing is the lipid component, not just hydration.
Macadamia oil contains 17-22% palmitoleic acid, one of the highest concentrations found in any botanical source that can be used in a daily leave-on formulation. Palmitoleic acid is the same fatty acid the sebaceous glands produce. This makes macadamia oil a structural match for what the skin has lost, not just a coating that temporarily reduces dryness.
When to apply
Do not apply moisturiser less than two hours before a radiotherapy session. Skin must be clean and dry before treatment begins. The two-hour gap gives the skin time to absorb the product and the surface to be clear before the radiation field is targeted.
Most patients find morning and evening application works well around treatment schedules. If treatment is in the morning, applying the evening before and again at least two hours prior gives the skin continuous support without conflicting with session timing.
If your skin is already significantly broken down
Dry, tight, or mildly pink skin responds well to a daily lotion applied consistently. If the skin has progressed to cracking, significant redness, or visible breakdown, a richer cream formulation provides more barrier support between applications.
Both Calm+ and Restore+ are formulated for radiation-affected skin and are suitable from the first day of treatment. Calm+ is the daily lotion for consistent barrier support. Restore+ is the heavier cream for areas where breakdown is more advanced.
Your care team should know what you are using. Bring the product to your next appointment if you are uncertain.
Frequently Asked Questions
Can I use any moisturiser during radiation treatment?
The most important requirement is fragrance-free. Beyond that, look for a product that addresses the oil component of the skin barrier, not just the water component. Radiation damages the glands that produce skin oils, so products that only replace moisture are less effective than those that also replenish lipids.
Is sorbolene safe to use during radiotherapy?
Sorbolene is fragrance-free and widely recommended in Australian cancer centres. It is a reasonable option for mild skin reactions. For skin that has become significantly drier or is reacting more severely, sorbolene's water-based formulation may not be sufficient to address the oil depletion that radiation causes.
Can I apply moisturiser right before my radiation session?
No. Apply moisturiser at least two hours before your appointment. Skin should be clean and dry when you arrive for treatment.
What does radiation do to the skin?
Radiation damages the sebaceous glands in the treatment field. These glands produce the skin's natural oils. Without them, the barrier loses its ability to hold itself together, which is why radiation-affected skin becomes dry and sensitive in ways that ordinary moisturisers do not address well.
When should I start moisturising during radiation treatment?
From the first day of treatment. The goal is to support the barrier before breakdown begins rather than trying to repair it after the fact. Consistent twice-daily application from the start of treatment gives the skin the best chance of holding up through the full course.
The question is not just whether a moisturiser is safe during radiation treatment. It is whether what you are using is designed for what radiation actually does. Most products on the shelf were not. Choosing one that is makes a material difference to how skin holds up across a course of treatment.
If you are going through treatment now or preparing to start, Calm+ was formulated specifically for this.