The desire for long, thick, and vibrant hair transcends eras and cultures. Many people have the frustrating feeling that their hair never grows, remaining stuck at the same length despite the passing months. The biological reality is more modest than we sometimes hope: on average, a hair grows between 1 and 1.5 centimeters per month, or approximately 12 to 18 centimeters per year under good conditions.
For many, this apparent stagnation is mainly due to breakage at the ends, which compensates for growth at the roots. Understanding the hair life cycle and adopting a few appropriate practices can optimize the conditions for healthier growth.
Understanding the hair life cycle
Each hair follows a three-phase biological cycle that renews itself throughout life.
The anagen phase corresponds to the period of active growth, during which the hair actually grows. It lasts between two and seven years depending on the individual, and its duration determines the maximum length a hair can reach. At any given time, approximately 85 to 90% of the hair is in the anagen phase, a proportion that remains stable in a healthy person according to Inserm .
The catagen phase is a brief transition period, lasting two to three weeks, during which the follicle ceases its activity and the hair gradually detaches from its nourishing papilla. Approximately 1 to 2% of the hair is in this phase at any given time.
The telogen phase is the resting period before the natural shedding of hair, which lasts approximately three months. About 10 to 15% of the hair is in the telogen phase at all times, which explains why it is perfectly normal to lose between 50 and 100 hairs per day: this shedding corresponds to the natural renewal of the hair follicle.
Trim the ends regularly
This advice may seem counterintuitive, but it's one of the most effective. The ends, the oldest part of the hair fiber, suffer years of cumulative damage: friction, UV rays, heat from styling tools, and chemical treatments. The protective cuticle gradually erodes, exposing the cortex and causing split ends .
Once formed, a split end cannot be repaired: if it is not cut, the crack travels up the hair shaft, weakening the hair along its entire length. As a result, the length gained at the root is lost through breakage at the ends, hence the impression of stagnation. Trimming half a centimeter to a centimeter every three to four months eliminates these weakened areas before they break spontaneously, thus preserving every centimeter gained at the root.
Create targeted natural treatments using plant oils
Vegetable oils are traditionally used to nourish and strengthen hair fibers. A weekly oil treatment, left on for at least 30 minutes under a warm towel to promote absorption, can be incorporated into your routine.
Castor oil is one of the most widely used for hair growth: rich in ricinoleic acid, it is traditionally associated with stimulating microcirculation in the scalp. A few drops are enough, applied mainly to the scalp and gently massaged for 5 to 10 minutes, before rinsing thoroughly.
Mustard oil is known for its thermogenic effect, which stimulates circulation through a sensation of heat. Its application time should be short, between 15 and 30 minutes, and a preliminary test on a small area is recommended for sensitive scalps: if any discomfort or burning sensation occurs, rinse immediately.
Other oils are also beneficial as complementary treatments: amla oil, traditionally used in Ayurveda to strengthen roots; coconut oil to limit protein loss from the hair fiber; avocado oil, rich in vitamins A, D, and E; and black seed oil for its purifying properties on the scalp. These oils can be combined or enriched with a few drops of cineole rosemary essential oil, traditionally used to stimulate microcirculation.
Adopting a healthy lifestyle
Hair directly reflects overall health. Sleep plays a crucial role: it is primarily during deep sleep that the body releases hormones that stimulate cell regeneration, including that of the hair follicle cells. A chronic lack of sleep can therefore lead to slowed growth and weakened hair fibers.
Food is the fuel for hair growth. B vitamins play a well-documented role: biotin (B8) participates in keratin synthesis, vitamin B6 contributes to cysteine production, and vitamin B9 promotes cell renewal. These vitamins are found in whole grains, legumes, eggs, lean meats, nuts, and leafy green vegetables. Zinc and selenium, antioxidant trace elements, protect hair cells from oxidative stress. Even a moderate deficiency can lead to weakened hair and increased breakage, giving the impression that hair growth has stopped.
Hydration is also important: drinking between 1.5 and 2 liters of water per day helps maintain good circulation to the hair follicles. Finally, choosing gentle hair products, free of harsh sulfates, heavy silicones, and parabens, helps preserve the hair fiber in the long term.
Massage and exfoliate the scalp regularly.
The scalp is often neglected, even though it's the foundation from which hair grows. Massaging it daily for 5 to 10 minutes with your fingertips in circular motions stimulates local microcirculation and delivers more oxygen and nutrients to the follicles. These massages also have a relaxing effect that can help reduce stress, one of the factors associated with hair loss.
Exfoliating your scalp once a week before shampooing helps remove dead skin cells and product buildup that can disrupt hair follicle function. A simple mixture of fine sugar or salt with a little vegetable oil, applied to a damp scalp and then rinsed, may be sufficient.
What is the normal growth rate?
Hair growth rates vary depending on genetic, hormonal, and environmental factors, but average 1 to 1.5 centimeters per month. This variation is generally moderate from person to person. Growth also tends to be slightly faster in spring and summer, and slower in autumn and winter. Understanding these natural rhythms allows for realistic expectations in the face of the sometimes exaggerated promises of certain products.
Precautions
In the event of a sudden slowdown in growth, significant hair loss or unusual change in hair density, it is recommended to consult a dermatologist in order to identify a possible underlying cause (deficiency, hormonal imbalance, scalp pathology) requiring specific treatment.
Frequently asked questions about hair growth
Does cutting your hair really make it grow faster?
Cutting hair does not accelerate growth at the root, but by removing weakened ends before they break, it helps to retain more of the length gained naturally.
Are scalp massages really effective?
Massages stimulate local microcirculation, which can improve nutrient delivery to the hair follicles. Some research suggests a positive effect on hair fiber thickness in the long term, in addition to a healthy lifestyle.
Is there a way to make hair grow faster than the biological average?
No, the rate of hair growth is primarily determined by genetics. Hair care and lifestyle can mainly help optimize growth conditions and limit breakage, but cannot override the hair's natural biological rhythm.