If you’re considering laser hair removal, you’ve probably wondered why treatments are spaced out and why results take time. The answer lies in how your hair grows. Understanding this can make a huge difference to your expectations, your results, and how confident you feel starting treatment.
Laser hair removal is most effective during the anagen phase, which is the active growth stage. At this point, the hair is still connected to the follicle and full of pigment. This allows the laser’s heat to travel down to the root and reduce future hair growth at the source.
Keep reading to understand more about the best stages of hair growth for laser hair removal. We explore the three key growth stages in more detail, explain why timing matters, and show you how laser technology can work with your body to achieve lasting results.
If you’re based in Hampshire and ready to take the next step, you can book a consultation with our friendly laser practitioners at any time.
Understanding your hair growth cycle and how it affects laser hair removal
To understand how laser hair removal works, it’s important to know the hair growth cycle. Every hair on your body moves through several stages, and not all hairs are in the same stage at the same time. It’s completely natural, and one of the main reasons why multiple laser treatments are more effective.
The growth cycle consists of three main phases:
- The anagen phase (active growth)
Cells multiply so your hair follicle can actively produce hair. - The catagen phase (transition phase)
Growth slows down, and the hair follicle shrinks. - The telogen phase (resting phase)
The final stage of growth, where the hair stops growing.
How long does a full hair growth cycle take?
A full hair growth cycle can take weeks or even months, depending on your hair and skin type and the area being treated. Facial hair growth, such as the upper lip or chin, tends to have a much shorter cycle and faster regrowth than body hair on areas like the legs, bikini line, or underarms.
| Facial hair | Body hair | |
|---|---|---|
| Example | Upper lip or chin | Legs, bikini line, or underarms |
| Cycle length | 4 to 6 weeks | 8 to 12 weeks (or longer) |
The first stage of hair growth: why the anagen phase matters
The first stage of hair growth is known as the anagen phase, which is the longest.
During the anagen phase:
- Your hair is actively growing
- The hair shaft is still connected to the root
- The hair contains the darkest pigment (melanin)
The anagen phase is when laser hair removal is most effective!
Because the hair is still connected to the follicle during this stage, the laser can reach right through to the root. The laser uses light energy that converts into heat energy and travels down the hair shaft to damage the follicle and reduce future hair growth.
If the hair is not in the anagen stage, the laser cannot reach the follicle.
Why laser hair removal is less effective in the catagen phase
The catagen phase is a short transitional period between the active growth phase and rest. It only lasts around 10 days.
During this transitional stage:
- Your hair stops growing
- The follicle shrinks
- The hair root begins to detach
- Pigment levels reduce
Because the hair shaft is no longer fully connected to the follicle, the laser beam cannot deliver heat energy to the root. While some heat may reach the surrounding skin, it won’t be enough to permanently damage the follicle and stop regrowth.
How long does a full hair growth cycle take?
A full hair growth cycle can take weeks or even months, depending on your hair and skin type and the area being treated. Facial hair growth, such as the upper lip or chin, tends to have a much shorter cycle and faster regrowth than body hair on areas like the legs, bikini line, or underarms.
| Facial hair | Body hair | |
| Example | Upper lip or chin | Legs, bikini line, or underarms |
| Cycle length | 4 to 6 weeks | 8 to 12 weeks (or longer) |
The first stage of hair growth: why the anagen phase matters
The first stage of hair growth is known as the anagen phase, which is the longest.
During the anagen phase:
- Your hair is actively growing
- The hair shaft is still connected to the root
- The hair contains the darkest pigment (melanin)
The anagen phase is when laser hair removal is most effective!
Because the hair is still connected to the follicle during this stage, the laser can reach right through to the root. The laser uses light energy that converts into heat energy and travels down the hair shaft to damage the follicle and reduce future hair growth.
If the hair is not in the anagen stage, the laser cannot reach the follicle.
Why laser hair removal is less effective in the catagen phase
The catagen phase is a short transitional period between the active growth phase and rest. It only lasts around 10 days.
During this transitional stage:
- Your hair stops growing
- The follicle shrinks
- The hair root begins to detach
- Pigment levels reduce
Because the hair shaft is no longer fully connected to the follicle, the laser beam cannot deliver heat energy to the root. While some heat may reach the surrounding skin, it won’t be enough to permanently damage the follicle and stop regrowth.
Does laser hair removal work during the telogen phase?
The telogen phase is the final stage of hair growth, often referred to as the resting phase. During this time, the hair is no longer growing and is no longer attached to the blood supply. It will eventually shed naturally before a new hair begins forming beneath the skin.
In the telogen phase:
- The hair follicle is inactive
- There is little to no pigment present
- The hair is not attached to the follicle
Laser hair removal won’t work at this stage because there is no ‘active’ target for the laser to hit. The heat energy cannot reach the follicle, meaning no long-term hair reduction occurs.
Why are multiple laser hair removal sessions needed?
Everyone has different growth patterns, so treatments vary from person to person. Plus, not all hairs are in the same growth cycle stage at the same time. At any given moment:
- Some hairs are in the anagen phase (around 85% to 90%)
- Others are in the catagen or resting phases (around 10% to 15%)
This is why laser hair removal is performed over multiple sessions. Each appointment targets hair that has entered the growing stage since your last treatment. Over time, this leads to a more effective hair reduction.
Different areas of the body also respond differently. Facial hair often needs more frequent sessions because it grows faster and is influenced by hormones, while body hair usually responds more slowly. Hormonal changes, including conditions such as PCOS, can increase hair growth and affect how many and how often sessions are needed.
Your hair colour and skin tone can also influence the treatment plan. Traditionally, treatments were most effective on darker hair and lighter skin because the laser could more easily target the pigment in the hair without affecting the surrounding skin. But now, with modern technology and experienced practitioners, lasers can be carefully adjusted to suit a range of skin types and tones.
Want to learn more? Discover why the Cynosure PicoSure laser is so well trusted for safe and effective laser hair removal results.
Does hair regrowth stop completely after laser hair removal?
Laser hair removal treatment doesn’t guarantee permanent hair removal for everyone. It’s generally considered a permanent hair reduction. Most people will see about a 90% reduction, and while some hair may grow back, it’s usually finer, lighter, and grows back far more slowly.
Your laser practitioner may suggest maintenance sessions after your treatment plan has finished, especially if you have hormonal fluctuations. A good laser practitioner will always work with your body and set realistic expectations based on your medical history, skin type, and treatment area.
A good post-treatment care plan also helps you get optimum results. This means keeping cool, wearing loose clothing, and skipping the gym, hot showers, and sweaty activities for the first couple of days. You should also avoid sun exposure, steer clear of harsh chemicals, and don’t pluck any hairs.
HA Laser Studio works with your hair growth cycle
The team at HA Laser Studio have been trained to work safely and effectively with your natural hair growth cycle. Your journey starts with a detailed initial consultation, where we assess your skin and hair type and your goals. From there, we create a personalised treatment plan for long-lasting results.
Book your consultation today!
Ready to reduce unwanted body hair and understand how laser hair removal can work for you? We’re here to guide you and help you feel confident in your skin. Book your consultation with HA Laser Studio today or get in touch with our friendly team to ask any questions.
