Low-Level Laser and Fertility: Supporting the Energy of the Developing Follicle

What is low-level laser therapy?

Low-level laser therapy (LLLT), also called photobiomodulation or PBM, uses specific wavelengths of red and near-infrared light at an intensity that does not heat or damage tissue. There is no needle, no UV and no sensation. We already use it at the clinic for pain and musculoskeletal conditions and as a needle-free way to stimulate acupuncture points.

Its interest for fertility comes down to one structure inside every cell: the mitochondrion. Light in the red and near-infrared range interacts with mitochondria, and mitochondria are central to how an egg grows and matures.

Why do mitochondria matter for fertility?

Mitochondria are often described as the powerhouses of the cell. They produce ATP, the energy currency every cell runs on. The egg (oocyte) is one of the most mitochondria-rich cells in the body, and its development and the first days of the embryo depend on mitochondrial ATP (Adhikari et al, 2022). In the egg, mitochondria are involved in:

• producing ATP for growth and maturation
• powering the cell division that prepares the egg for fertilisation
• regulating calcium inside the cell
• managing oxidative balance
• supplying the energy the embryo relies on in its first days

The egg does not do this alone. It sits inside a follicle, surrounded by granulosa and cumulus cells that feed it nutrients such as pyruvate. Fertility is not only about the egg itself. It is a working relationship between the egg, the cells around it, the follicle and its blood supply. When mitochondria work poorly, research links this to lower energy production, more oxidative stress and eggs that are less able to mature, which is part of why egg quality tends to decline with age.

What happens during the follicular phase?

The follicular phase runs from the first day of your period until ovulation. During this time a group of follicles begins to develop, and usually one becomes dominant and goes on to release its egg. It is one of the most energy-hungry periods of the cycle:

1. Menstruation. A new group of follicles is recruited.
2. Early follicular development. Granulosa cells multiply and become more active.
3. Follicle growth. The follicle enlarges and its metabolic demand rises.
4. Egg maturation. The egg prepares for ovulation, drawing heavily on mitochondrial energy.
5. Ovulation. The dominant follicle releases its egg.

Because this is when the follicle and egg are developing, it is the window where supporting cellular energy makes the most biological sense. That is why we time fertility laser sessions to the first half of the cycle.

How might light support cellular energy?

Red and near-infrared photons are absorbed by light-sensitive molecules inside cells, including parts of the mitochondrial energy chain. A simplified model of the proposed pathway looks like this:

1. Light. Red or near-infrared photons reach the tissue.
2. Mitochondrial interaction. Photons are absorbed by photoacceptors in the mitochondria.
3. Cellular energy. Mitochondrial activity shifts, which may influence ATP production.
4. Cell signalling. Changes follow in redox balance and the cell's signalling pathways.
5. Follicular environment. These effects could influence the metabolic environment around developing follicles.
6. Egg development. Because the egg relies so heavily on mitochondrial energy, a well-supported environment may be relevant to how it matures.

Why does the dose matter?

Photobiomodulation is not a case of more light giving a better result. It has what is called a biphasic dose response: a dose that stimulates a cell can become less effective, or even inhibitory, if it is too high.

The dose depends on several things together: wavelength, power, the size of the area treated, treatment time and whether the light is continuous or pulsed. We set these deliberately for each session rather than borrowing a time from another device or another condition.

Which laser do we use, and why?

We use the Polylaser Trion 155D, a clinical therapy laser rather than an LED panel. It has twelve laser diodes, 600 mW in total, treating an area of about 20 cm² at once, and it combines two wavelengths:

• 655 nm red light. Shallower penetration, acting on superficial tissue and circulation.
• 785 nm near-infrared light. Deeper penetration, and within the near-infrared band being studied for its effect on mitochondria.

A laser delivers a more precisely defined wavelength and dose than a general LED device, which is why we chose one for this work. The 785 nm output sits close to the 810 to 850 nm wavelengths used in human fertility research, though we cannot assume it behaves identically. Depth of penetration is also not the same as reaching the ovaries: body shape, tissue thickness and probe position all matter.

Fertility is not one of the Trion's listed indications, and we describe it that way.

How do we use laser in fertility care at Rozelle?

We use it as an adjunct within a normal fertility appointment, not as a stand-alone program. Light is applied to the lower abdomen and to acupuncture points, alongside acupuncture or in place of needles if you prefer. It takes a few minutes, you feel nothing, and you wear eye protection while the device is on.

We apply it in the follicular phase, before ovulation or before an embryo transfer, and never over the abdomen once you could be pregnant. If you are in an IVF cycle, we fit around your clinic's schedule and are happy to talk to your specialist about what we are doing. Nothing we do replaces their care.

We suggest a defined trial period rather than an open-ended course, and we will tell you honestly at each review whether it seems worth continuing. Read more about how we approach fertility care and what to ask any fertility acupuncturist.

Is low-level laser safe?

At the intensities used in clinic, laser therapy does not heat or damage tissue, and side effects are rare. Device manufacturers and professional guidance still set out clear precautions, and we follow them.

Where does the evidence sit?

The link between mitochondrial health and fertility is well established. Whether light can meaningfully change mitochondrial function in the human ovary, and turn that into more pregnancies, is still an open question. The early signals are interesting: in aged mice, laser to the ovaries was associated with more follicles and better mitochondrial function, and in the laboratory, human eggs exposed to 810 nm light matured faster with more energy production. A 2026 pilot in women found a higher antral follicle count after LED treatment, though the number of eggs retrieved did not change significantly.

Our position is simple: nourish the cell, support the environment, respect the science. The mechanism is plausible and the treatment is gentle, which makes it a reasonable thing to add alongside good medical care for people who want to, and the wrong thing to promise results from. If you would like to talk it through, book an appointment or call us on 0499 911 552.