You notice it in the shower: more hair than usual in the drain. Then in your brush, an amount that seems excessive to you. Or simply in the mirror, that feeling that your hair has less volume than six months ago, that your part is wider, that your temples seem thinner. Hair loss is one of the most frequent dermatological complaints, and also one of the most misinterpreted phenomena: most people who are alarmed by their hair loss present a completely normal or reversible process once the cause is identified.
The problem is that on the internet, clinically valid advice and myths that can delay a correct diagnosis for months coexist with equal prominence. In this guide, we will explain how your hair's life cycle works at a follicular level, why it is interrupted, which causes have real evidence, and which strategies, including those of natural cosmetics, can make an authentic difference.
Biology of the Hair Cycle: What Happens Under the Skin
Hair does not grow continuously. Each hair follicle independently follows a biological cycle of three phases that repeats throughout life.
Anagen Phase: Active Growth
This is the active growth phase, during which the cells of the dermal papilla at the base of the follicle actively divide and produce the hair fiber. In a healthy scalp, between 85% and 90% of follicles are in the anagen phase at any given time. This phase lasts between 2 and 6 years on the scalp, which explains why hair can grow up to 90-120 centimeters before naturally falling out. The longer the anagen phase, the longer the hair can be.
Catagen Phase: Transition
This is a brief phase of 2 to 3 weeks during which the follicle progressively "shuts down." The dermal papilla stops dividing, the hair bulb retracts, and the hair stops growing. It represents less than 1% of scalp follicles at all times.
Telogen Phase: Rest and Shedding
The follicle enters a resting state of approximately 3 months, during which the hair remains "anchored" but inactive. At the end of this phase, the hair detaches, and the follicle begins a new anagen cycle. It is normal to lose between 50 and 100 hairs per day as a result of the natural transit of follicles through the telogen phase. When this number significantly increases diffusely across the scalp, we speak of telogen effluvium: a massive interruption of the anagen phase that pushes an abnormally high percentage of follicles into the shedding phase simultaneously.
Types of Hair Loss: Not All Hair Loss is the Same
Telogen Effluvium: Diffuse and Temporary Hair Loss
This is the most frequent form of accelerated hair loss and, in most cases, completely reversible. It occurs when a triggering factor—severe stress, febrile illness, surgery, childbirth, nutritional deficiency—pushes a high percentage of follicles into the telogen phase simultaneously. The most confusing aspect of telogen effluvium is its latency of 6 to 12 weeks: visible hair loss begins months after the triggering factor, making it very difficult to identify the cause without a detailed clinical history. A person who suffered a severe infection in January may start noticing excessive hair loss in March or April.
Androgenetic Alopecia: Pattern Hair Loss
This is the most frequent form of long-term hair loss and has a genetic and hormonal basis. In men, it manifests as a receding hairline and crown thinning; in women, as diffuse thinning in the central area and part, preserving the frontal hairline. The mechanism involves the sensitivity of certain follicles to dihydrotestosterone (DHT), a testosterone derivative that progressively miniaturizes the follicle until it stops producing terminal hair. Androgenetic alopecia is not reversible without specialized pharmacological or capillary treatment, but it can be slowed down and halted.
Alopecia Areata: Localized Hair Loss
This is an autoimmune disease in which the immune system attacks hair follicles, causing hair loss in rounded or oval patches with well-defined borders. Unlike telogen effluvium, the hair loss is localized, not diffuse, and the follicles are not destroyed: they can recover if the disease is treated properly. It requires dermatological diagnosis.
In-Depth Causes: What Disrupts the Hair Cycle
Stress: The Most Underestimated Hormonal Disruptor
Chronic or severe acute stress activates the hypothalamic-pituitary-adrenal axis, raising blood cortisol levels. Cortisol has receptors in hair follicles and, in sustained high concentrations, prematurely interrupts the anagen phase and pushes follicles into the telogen phase. This is the mechanism of stress-induced telogen effluvium: the body's biological survival response sacrifices "non-essential" resources—such as hair growth—to prioritize vital functions.
Nutritional Deficiencies: The Most Frequent and Least Diagnosed
Hair follicles are rapidly dividing cells that require a constant supply of specific micronutrients. The deficiencies most frequently associated with hair loss are:
Iron (low ferritin): the most documented. Follicles have a very high demand for iron for their mitotic activity. Ferritin levels below 30-40 ng/mL are consistently associated with telogen effluvium, even in the absence of anemia.
Zinc: participates in keratin synthesis and androgen regulation. Its deficiency reduces the duration of the anagen phase.
Vitamin D: its receptors are present in hair follicles, and its deficiency is associated with a higher prevalence of alopecia areata and telogen effluvium.
Biotin (vitamin B7): although its actual deficiency is rare in balanced diets, it is one of the best-selling hair supplements. It is only effective if there is a real pre-existing deficiency.
Hormonal Imbalances
Postpartum is the most frequent cause of telogen effluvium in women of childbearing age. During pregnancy, elevated estrogen levels artificially prolong the anagen phase—hair grows more than ever. After childbirth, the sharp drop in estrogen pushes all those retained follicles into the telogen phase simultaneously, producing massive shedding between 3 and 6 months postpartum. This is a normal physiological process, although emotionally very distressing, and in most cases, it resolves spontaneously. Hypothyroidism and polycystic ovary syndrome are also associated with hair loss through specific hormonal mechanisms.
Aggressive Hair Products: The Silent Damage to the Scalp
Shampoos with sulfates (SLS, SLES) repeatedly attack the scalp, altering the lipid barrier, inflaming the follicular microenvironment, and interfering with nutrient supply to the follicle. Parabens and silicones clog follicles and hinder scalp oxygenation. Damage from aggressive products rarely causes permanent alopecia, but it can shorten the duration of the anagen phase and contribute to chronic diffuse hair loss that worsens other underlying factors.
Myths and Complications
"Baldness comes from the maternal grandfather"—the X-chromosome gene myth
It is true that the most studied androgen receptor gene in androgenetic alopecia is found on the X chromosome, inherited by men exclusively from their mothers. However, androgenetic alopecia is polygenic: multiple genes distributed on different chromosomes contribute to the risk. The father's pattern also matters, and there are men with maternal grandfathers with abundant hair who still develop alopecia. Looking only at the maternal family is a simplification that can give a false sense of security.
"Cutting your hair makes it grow stronger"—false
Hair is a filament of dead keratin. It has no sensors that communicate to the follicle that it has been cut. Cutting does not stimulate growth or strengthen the follicle. What happens is that freshly cut hair has clean ends without split ends, which makes it appear thicker and healthier visually. The state of the follicle and the phase of the hair cycle are independent of what happens at the external end of the hair.
The Consequences of Not Identifying the Cause
An untreated telogen effluvium in its underlying causes—especially if there is an undiagnosed ferritin deficiency or hypothyroidism—can become chronic and turn into persistent hair loss for months or years. Treating hair loss with topical products without correcting the systemic cause is partially ineffective. Basic analytics (ferritin, TSH, zinc, vitamin D) is the first step before any treatment.
Care Strategy: A Root-Based Approach
Analytics First: Know Your Cause
Before investing in supplements or hair treatments, it is essential to rule out or identify systemic causes through basic analytics that include: ferritin, TSH (thyroid hormone), zinc, vitamin D, complete blood count, and basic hormonal profile if applicable. A low ferritin result is one of the most frequent and easily treatable findings in women with diffuse hair loss.
Rosemary Oil: The Natural Ingredient with the Most Evidence
A comparative study published in Skinmed (2015) compared the efficacy of 2% rosemary oil with 2% minoxidil in people with mild-to-moderate androgenetic alopecia over 6 months. The result: both showed comparable efficacy in hair count, with the advantage that rosemary oil produced significantly less scalp itching. Its mechanism of action involves improving microcirculation in the scalp, which increases nutrient supply to the follicle, and inhibiting 5-alpha reductase, the enzyme that converts testosterone into DHT. It can be applied diluted in a carrier oil (jojoba, argan) with a gentle massage on the scalp, 30 minutes before washing.
Sulfate-Free Shampoo: Protect the Follicular Microenvironment
Switching to a sulfate-free shampoo protects the scalp's lipid barrier, reduces follicular inflammation, and allows the scalp to maintain the optimal pH for follicle health. In combination with a scalp inflamed by telogen effluvium, sulfates aggravate the problem. An eco-friendly sulfate-free shampoo with gentle plant-derived surfactants is a basic change that should accompany any hair loss treatment.
Scalp Massage: Mechanical Stimulation with Evidence
Daily 4-minute scalp massage for 24 weeks has shown an increase in hair thickness in people with androgenetic alopecia in clinical trials. The mechanism involves mechanical stimulation of dermal papilla cells, improved local microcirculation, and reduced perifollicular fibrosis. It is the simplest, cost-free, and scientifically backed intervention you can start today.
You can enhance the massage by first applying rosemary essential oil diluted in organic vegetable oil to combine mechanical stimulation with rosemary's vasodilator and anti-DHT effects.
About Alma Eko
Alma Eko is a store specializing in natural, vegan, and toxin-free cosmetics. Its hair care catalog includes sulfate-free shampoos and organic essential and vegetable oils formulated with ingredients that respect the follicular microenvironment. You can explore the entire catalog at almaeko.com.
Frequently Asked Questions
1. How many hairs is it normal to lose per day?
Between 50 and 100 hairs daily is considered the physiological range for an adult with a normal hair cycle. This number can vary depending on hair thickness, individual cycle, and seasonal factors: many people notice more shedding in autumn, partly because follicles that synchronized their entry into the telogen phase during the summer coincide in falling out in the following months. If shedding visibly exceeds this threshold for more than 4-6 weeks, it is advisable to consult a dermatologist.
2. Does telogen effluvium cure itself?
In most cases, yes, provided the triggering factor is removed. Acute telogen effluvium due to specific stress, illness, or childbirth resolves spontaneously within 3 to 6 months. If the triggering factor is chronic—continuous stress, uncorrected nutritional deficiency, untreated hypothyroidism—the hair loss can persist indefinitely. That's why identifying and correcting the cause is essential.
3. Do biotin supplements work for hair loss?
Biotin (vitamin B7) is essential for keratin synthesis, but its deficiency is rare in people with a varied diet that includes eggs, nuts, and legumes. Biotin supplements only produce a visible benefit in people with a real pre-existing deficiency. In people without a deficiency, taking extra biotin does not accelerate hair growth or reduce hair loss. Before supplementing, it is preferable to measure the level through analytics.
4. Can hair recover after massive hair loss?
In telogen effluvium, yes: the follicles are not damaged, only in premature rest. Once the cause is resolved, the follicles restart the anagen phase, and hair grows back, although the process can take between 6 and 12 months to visibly complete. In advanced androgenetic alopecia, miniaturized follicles may not recover without medical intervention, although early treatments can significantly slow progression.
5. Does heat from styling tools cause hair loss?
The heat from straighteners, dryers, and curling irons does not damage the follicle (which is under the skin and does not directly receive heat), but it does destroy the structure of the cuticle and hair cortex, increasing hair fragility and breakage. The "hair loss" observed when using heat frequently is actually hair fiber breakage, not shedding from the follicle. The clinical difference is important: broken hair has an irregular end, while hair that falls from the follicle has a visible white bulb at the root.
6. Where can I find natural hair products for hair loss?
Complementary products that can help—sulfate-free shampoo, rosemary essential oils, vegetable oils for massage—can be found at Alma Eko, where the entire hair care selection is formulated without ingredients that could aggravate the follicular environment. Remember that these products are complementary to treating the underlying cause, not substitutes.
