Hormones and Hair Loss: Why So Many Women Are Affected — And What You Can Do About It

In our blog post "Female Cycle and Hormonal Imbalances: What Your Body Wants to Tell You", we have already provided comprehensive information on the female hormone balance – how imbalances arise and what measures can help. One aspect that has been little explored until now is a question that many women are concerned about: Why do so many of them lose hair – and what does this have to do with hormones?

This article sheds light on the most important hormonal connections in female hair loss – from the effect of individual hormones on the hair cycle to specific life phases such as stopping the pill, the time after childbirth, and menopause.

1. How Hormones Control Hair Growth

Hair growth follows a cyclical process consisting of the growth phase (anagen phase), the transitional phase (catagen phase), and the resting or shedding phase (telogen phase). Hormonal influences play an important role in regulating these phases.

• Estrogens tend to promote growth by extending the anagen phase. This means hair stays in the growth phase longer and appears denser and stronger overall.
• Androgens (e.g., testosterone and especially dihydrotestosterone — DHT) can lead to a miniaturization of hair follicles with a corresponding genetic predisposition. This manifests as thinning hair and shortened growth cycles.
• Progesterone can indirectly have a protective effect, as the hormone can help mitigate the influence of androgens – especially DHT – on hair follicles. Sufficient progesterone levels can therefore support hair growth and the maintenance of hair structure.

2. What Happens When the Hormonal Balance Tips?

A hormonal imbalance – for example, as a result of chronic stress, hormonal contraception, stopping hormonal preparations, pregnancy, menopause, or endocrine diseases – can sensitively affect the natural hair cycle. If the interplay of hormones becomes unbalanced, the growth phase of the hair often shortens, while at the same time more hairs enter the resting and shedding phases. This can lead to diffuse hair loss, reduced hair density, and an overall weakened hair structure.

The problem is often not just short-term, but can last for months or even years. The reason for this is that hormonal changes often regulate only slowly, and hair follicles are very sensitive to internal stresses. Once the natural hair cycle is disturbed, hair roots usually need a lot of time to return to a stable growth phase. At the same time, persistent stress, lack of sleep, inflammatory processes, or nutrient deficiencies can additionally hinder regeneration. Many affected individuals therefore experience that hair loss continues even after the original trigger has subsided.

3. Hair Loss After Stopping the Pill

The birth control pill actively intervenes in the hormone balance. While taking it, the body's own hormone fluctuations are suppressed, and an artificially stable hormone level is maintained. Many preparations contain estrogens and gestagens that can have an androgen-inhibiting effect. This reduces the effect of androgens, causing hair to remain in the growth phase longer and appear denser and stronger overall.

What happens after discontinuation?

After stopping the pill, a hormonal readjustment occurs. The previously artificially elevated estrogen level drops, while the relative effect of androgens increases. As a result of this change, many hairs simultaneously switch from the growth phase to the resting phase.

This process typically becomes noticeable with a delay: About two to three months after discontinuation, increased hair loss occurs – a so-called telogen effluvium. The reason for this is that during pill intake, more hairs than usual are kept in the growth phase. After discontinuation, these hairs return to their natural cycle and synchronously enter the shedding phase. This creates the impression of sudden and increased hair loss, which, however, is temporary in most cases.

4. Postpartum Effluvium — Hair Loss After Childbirth

After childbirth, many women experience increased, diffuse hair loss, known as postpartum effluvium. This is a form of telogen effluvium – a temporary hair loss in which an above-average number of hairs are simultaneously in the resting and subsequent shedding phases.

Physiological Background

During pregnancy, estrogen levels are significantly elevated, especially in the second and third trimesters. Estrogen prolongs the anagen phase, causing more hairs than usual to remain in the growth phase simultaneously. After birth, estrogen levels drop abruptly – the previously prolonged hairs synchronously enter the telogen phase, and about two to three months later, increased hair loss occurs.

Additional Influencing Factors

In addition to hormonal changes, other factors can exacerbate hair loss:

• Iron deficiency due to blood loss during childbirth, which impairs hair follicle supply
• Nutrient deficiencies due to increased demand during pregnancy and breastfeeding – e.g., zinc, vitamin D, B vitamins
• Lack of sleep and stress, which can affect hormonal regulatory circuits (e.g., cortisol) and further disturb the hair cycle

Prognosis

Postpartum effluvium is temporary in most cases. The hair cycle usually normalizes within 6–12 months, provided there are no other underlying deficiencies or hormonal disorders.

5. Hair Loss in Menopause

During menopause, profound hormonal changes occur. In particular, the production of estrogen and progesterone in the ovaries continuously decreases. However, these hormones play an important role in the hair growth cycle: Estrogens prolong the anagen phase, and progesterone can inhibit the activity of 5-α-reductase – the enzyme that converts testosterone into the more biologically active DHT.

Why Does the Balance Tip?

With the decline of estrogen and progesterone, the hormonal balance shifts: the amount of androgens remains relatively constant or decreases only slightly, so their effect becomes proportionally stronger. This relative androgen dominance can be particularly noticeable in the hair follicles. In individuals with a genetic predisposition, DHT causes miniaturization of the hair follicles – the growth phase shortens, and the regrowing hairs become thinner and shorter. Often, this is a combination of hormonally induced follicle changes and telogen effluvium.

Typical Consequences in Menopause:

• Thinning, less dense hair
• Slowed hair growth
• Increased hair loss
• Androgenetic thinning, especially in the part area

6. Which Nutrients Help — for Hair and Hormonal Balance

Especially with hormonally induced hair loss, attention is often paid only to the hormones themselves. However, it is often underestimated how closely hormonal processes, metabolism, and nutrient supply are linked. Hair follicles react particularly sensitively to internal changes and require a continuous supply of essential micronutrients for healthy growth. If these are lacking or if the demand increases – for example, due to stress, hormonal changes, or physical strain – this can additionally impair the hair cycle and make it more difficult for the hair roots to regenerate.

Particularly relevant are:

Biotin (Vitamin B7)

Biotin contributes to the maintenance of normal hair and plays an important role in energy metabolism and in the formation of keratin, a central structural protein of hair.

Zinc

Zinc is involved in numerous enzymatic processes and supports cell division and the regeneration of hair follicles. It also contributes to the protection of cells from oxidative stress.

Iron

Iron deficiency is one of the most common causes of diffuse hair loss in women. Iron is important for oxygen transport and thus for the supply of energy and nutrients to the hair roots.

Selenium

Selenium supports the protection of cells from oxidative stress and is important for normal thyroid function, which in turn is closely linked to hair growth.

Vitamin D

Vitamin D plays a role in the regulation of the hair follicle cycle. Low vitamin D levels are more frequently observed in studies in people with various forms of hair loss.

Vitamin A

Vitamin A supports normal cell division and contributes to the maintenance of healthy skin and mucous membranes. A healthy scalp forms the basis for strong hair growth.

Vitamin E

Vitamin E acts as an antioxidant and helps protect cells from oxidative stress. This can support the health of the scalp and hair follicles.

B Vitamins (especially B12 & Folate)

B vitamins support energy metabolism and cell regeneration and can thus support the regeneration of actively growing tissues such as hair roots.

L-Cysteine & L-Methionine

These sulfur-containing amino acids are important components of keratin, the main structural protein of hair. They support the structure and stability of hair.

Omega-3 Fatty Acids

Omega-3 fatty acids are components of cell membranes and play a role in inflammation-regulating processes. They can contribute to the health of the scalp and hair follicles and nourish skin, hair, and nails from within.

Frequently Asked Questions (FAQ)