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The Human Hair Growth Cycle Explained! Anagen Phase (Growth Phase)

The human hair growth cycle consists of three main phases:

  1. Anagen Phase (Growth Phase):

    • This is the active phase of hair growth.

    • Hair follicles are actively producing new hair strands.

    • The duration of the anagen phase varies from person to person but typically lasts 2 to 7 years.

    • Hair grows about half an inch (1.25 cm) per month during this phase.

    • The longer the anagen phase, the longer the hair can grow.

  1. Catagen Phase (Transitional Phase):

    • This is a brief transitional phase that follows the anagen phase.

    • Hair growth slows down, and the hair follicle begins to shrink.

    • This phase lasts for about 2 to 3 weeks.

    • Only a small portion of hair follicles are in this phase at any given time.

  1. Telogen Phase (Resting Phase):

    • During this phase, the hair follicle is at rest.

    • No new growth occurs, and the existing hair is held in place.

    • Lasts for about 3 to 4 months.

    • Eventually, old hair is shed to make way for new hair in the anagen phase.

Hair follicles on different parts of the body have varying growth cycles, which is why some hair grows longer than others. Scalp hair, for example, typically has a longer anagen phase compared to body or facial hair.

The entire cycle repeats itself continuously, with different hair follicles at different stages of the cycle. The length and thickness of your hair are influenced by factors like genetics, age, health, and hormonal changes.


Let's dive deeper into the Anagen Phase, which is the active phase of hair growth:

  1. Follicle Activity:

    • During the Anagen Phase, the hair follicles are in a state of high activity.

    • The base of the hair follicle, known as the papilla, is responsible for nourishing the hair strand.

    • Blood vessels deliver essential nutrients and oxygen to the papilla, promoting healthy hair growth.

  1. New Hair Production:

    • This phase is characterized by the continuous production of new hair strands.

    • The cells in the hair matrix, located near the papilla, divide and differentiate into specialized cells that make up the hair shaft.

    • These cells produce the keratin protein, which forms the structure of the hair.

  1. Variability in Duration:

    • While the Anagen Phase typically lasts 2 to 7 years, it's important to note that the duration varies from person to person.

    • Genetic factors play a significant role in determining the length of the Anagen Phase for an individual.

    • Factors such as age, hormones, and overall health can also influence the duration.

  1. Growth Rate:

    • Hair growth during the Anagen Phase is not constant but rather occurs at a consistent rate.

    • On average, hair grows about half an inch (1.25 cm) per month.

    • This rate may vary slightly between individuals, and factors like diet and overall health can impact growth speed.

  1. Hair Length Potential:

    • The length that hair can reach is directly related to the duration of the Anagen Phase.

    • Those with a longer Anagen Phase can grow their hair longer before it enters the Catagen Phase and eventually the Telogen Phase, where it sheds.

To maintain healthy hair growth during the Anagen Phase, it's essential to provide the body with proper nutrition, including vitamins and minerals like biotin, iron, and zinc. Additionally, avoiding excessive heat styling and harsh hair treatments can help preserve the integrity of the hair shaft, allowing it to grow longer and healthier.


Several factors can slow down the Anagen Phase (active phase of hair growth). Here are some common factors that can have this effect:

  1. Genetics: Genetic factors play a significant role in determining the length of the Anagen Phase for an individual. If you have a family history of shorter Anagen Phases, it may affect your hair's growth potential.

  2. Age: As people age, the duration of the Anagen Phase tends to shorten. Hair growth may slow down, and hair strands may become finer and more fragile.

  3. Hormonal Changes: Hormonal fluctuations can impact the Anagen Phase. Conditions such as pregnancy, menopause, and hormonal disorders can lead to changes in hair growth patterns. An increase in certain hormones can extend the Anagen Phase, while imbalances may shorten it.

  4. Stress: High levels of stress, whether physical or emotional, can disrupt the hair growth cycle. Stress can lead to an increase in the release of hormones like cortisol, which can affect hair follicles and potentially shorten the Anagen Phase.

  5. Nutritional Deficiencies: Inadequate intake of essential nutrients, such as iron, biotin, and protein, can affect the health of hair follicles and may lead to a shorter Anagen Phase.

  6. Medical Conditions: Certain medical conditions, such as alopecia areata and thyroid disorders, can interfere with the hair growth cycle, potentially shortening the Anagen Phase.

  7. Medications: Some medications, particularly those used in cancer treatment (chemotherapy), can affect the hair growth cycle and cause temporary hair loss by shortening the Anagen Phase.

  8. Hair Treatments: Excessive use of harsh hair treatments, frequent heat styling, and chemical processes like bleaching and perming can weaken hair and potentially shorten the Anagen Phase.

  9. Environmental Factors: Environmental stressors like exposure to pollution and UV radiation can affect hair health and potentially disrupt the hair growth cycle.

To support a longer Anagen Phase and healthy hair growth, it's important to maintain a balanced diet, manage stress, and avoid excessive hair treatments and heat styling. If someone is concerned about hair loss or changes in their hair growth cycle, consulting a healthcare professional or a dermatologist is advisable to identify the underlying cause and explore potential treatments or lifestyle adjustments.


Overloading the scalp with excessive hair products can potentially have a negative impact on the health of the scalp and hair follicles, which in turn may indirectly affect the Anagen Phase (active phase of hair growth). Here's how this can happen:

  1. Product Buildup: Using too many hair products, such as styling gels, creams, and sprays, can lead to product buildup on the scalp. This buildup can clog hair follicles, disrupt the scalp's natural balance, and potentially hinder hair growth.

  2. Irritation: Some hair products may contain harsh chemicals or ingredients that can irritate the scalp. Irritation and inflammation of the scalp can disrupt the normal hair growth cycle, including the Anagen Phase.

  3. Weight and Strain: Heavy or greasy products, when applied in excess, can make hair feel heavy and weigh it down. This added weight can strain the hair follicles and potentially contribute to weaker hair growth.

  4. Allergic Reactions: Individuals may develop allergic reactions to certain hair products, which can lead to scalp itching, redness, and inflammation. These reactions can negatively affect the hair growth cycle.

  5. Imbalanced pH: Some hair products can disrupt the natural pH balance of the scalp. An imbalanced pH can make the scalp less conducive to healthy hair growth.

  6. Drying and Damage: Certain products, particularly those with high alcohol content or strong chemicals, can lead to dry and damaged hair. Damaged hair is more prone to breakage and may not reach its full potential during the Anagen Phase.

To maintain a healthy Anagen Phase and promote optimal hair growth, it's essential to strike a balance in the use of hair products. Here are some tips:

  • Use products that are suitable for your hair type and scalp condition.

  • Avoid overusing products and follow recommended application guidelines.

  • Periodically clarify the scalp to remove product buildup.

  • Opt for products with natural and nourishing ingredients.

  • Be mindful of any signs of scalp irritation or allergic reactions and discontinue use if necessary.

By maintaining a healthy scalp and hair, you can help ensure that the Anagen Phase proceeds optimally, allowing your hair to grow to its full potential.


A well-balanced diet rich in specific nutrients can help support the Anagen Phase (active phase of hair growth) by providing the necessary building blocks for healthy hair. Here are some foods that can promote hair growth and support this phase:

  1. Protein-Rich Foods:

    • Hair is primarily made of protein (keratin), so it's crucial to include protein-rich foods in your diet.

    • Good sources of protein include lean meats, poultry, fish, eggs, dairy products, legumes, and tofu.

  1. Iron-Rich Foods:

    • Iron is essential for transporting oxygen to hair follicles, promoting healthy hair growth.

    • Incorporate iron-rich foods such as lean red meat, poultry, fish, beans, lentils, and spinach.

  1. Omega-3 Fatty Acids:

    • Omega-3 fatty acids support scalp health and may help reduce hair loss.

    • Include fatty fish like salmon and mackerel, flaxseeds, chia seeds, and walnuts in your diet.

  1. Biotin:

    • Biotin, a B-vitamin, is known for its role in hair health.

    • Foods rich in biotin include eggs, nuts, seeds, sweet potatoes, and spinach.

    1. Vitamin A:

    • Vitamin A helps produce sebum, a natural scalp conditioner.

    • Consume foods like sweet potatoes, carrots, spinach, and kale for vitamin A.

  1. Vitamin C:

    • Vitamin C is crucial for collagen production, which is essential for strong hair.

    • Enjoy citrus fruits, strawberries, bell peppers, and broccoli for vitamin C.

  1. Zinc:

    • Zinc supports hair tissue growth and repair.

    • Include foods like oysters, nuts, seeds, and whole grains to boost your zinc intake.

  1. Vitamin E:

    • Vitamin E has antioxidant properties that can help protect hair follicles.

    • Sources of vitamin E include almonds, sunflower seeds, and spinach.

  1. Silica:

    • Silica is a mineral that supports hair health and strength.

    • Foods like oats, brown rice, and cucumbers contain silica.

  1. Collagen:

    • Collagen supplements or foods rich in collagen can help improve hair strength and texture.

    • Collagen can be found in bone broth, collagen supplements, and collagen-rich foods like chicken skin and fish.

    1. B Vitamins:

    • B vitamins, such as Biotin (B7), B5, and B6, play various roles in hair health.

    • Consume whole grains, eggs, avocados, and nuts to ensure an adequate intake of B vitamins.

Remember that maintaining a balanced diet that includes a variety of nutrient-rich foods is key to supporting overall health, including hair health. Additionally, staying hydrated by drinking plenty of water is also essential for maintaining a healthy scalp and promoting hair growth. If you have specific dietary concerns or restrictions, consider consulting with a healthcare professional or a registered dietitian for personalized guidance on optimizing your diet for healthy hair growth.

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