This article on the nail pattern after androgen replacement therapy proposes a mechanism involving estrogen: testosterone is converted to estrogen by aromatase, and the resulting elevated nitric oxide in the endothelium improved peripheral circulation in the nail matrix, which the authors say caused the nail growth acceleration. This is relevant because it links higher estrogen exposure to faster nail growth.

During pregnancy, women experience a sudden and dramatic increase in estrogen and progesterone. These hormonal changes have been shown to result in rapid nail growth during pregnancy, but decrease the rate of nail growth during lactation.

Yet another answer to ‘how does menopause impact nail growth?’ is that it stalls growth altogether. Nails tend to grow more slowly during menopause. “This slowed growth is also partly due to the reduction in estrogen,” says Dr. Kopelman. “This is because the hormone influences cell turnover and growth rates, including those of nail cells.”

The resulting manifestations are recognizable: nails that peel in layers or break easily, vertical ridges along the full length of the nail, dry cuticles and a tendency to hangnails, slower growth than usual. ... The decline in estrogen is a very important factor in this phase of life, but other elements can contribute to or amplify the picture: deficiencies in iron, zinc, vitamin D or biotin, thyroid dysfunction, chronic stress, dermatological conditions. ... Estrogen supports keratin synthesis, the protein that forms the nail structure. When estrogen declines, keratin decreases and the nail loses structural strength.

During menopause, the dramatic decrease in estrogen production significantly affects nail composition and growth. ... Slower nail growth (average reduction of 0.2mm per month) ... Average reduction in growth speed by 0.2-0.5mm per month. ... Yes, slower nail growth is a common occurrence during menopause. This happens because hormonal changes can affect the nail matrix’s ability to produce new cells efficiently.

Estrogen can also increase blood flow by 20%–30%, which is vital for healthy fingernails. ... Research suggests that estrogen promotes the production of keratin. With declining estrogen levels during menopause, keratin levels also decrease, which may make the fingernails weak and brittle. ... Various hormones support the health and thickness of nails, such as thyroid and estrogen, and low levels of these hormones can cause brittle nails.

The article explains that estrogen is important for nail health: "Estrogen: Estrogen is a hormone primarily associated with female reproductive health, but it also influences nail health. Higher estrogen levels, such as those during pregnancy or hormone replacement therapy, can promote faster nail growth and improve nail strength. However, a decrease in estrogen levels, such as during menopause, can lead to slower nail growth, thinning nails, and increased brittleness." This directly links lower estrogen with slower, not faster, nail growth.

Healthy fingernails must be hydrated. Since estrogens are responsible for keeping water in body tissues, lowered estrogen levels contribute to less healthy fingernails.

Topping up your declining levels of estrogen by taking HRT often improves the quality of your skin, the strength of your nails, and the look and feel of your hair. ... Your fingernails and toenails are made of a protein called keratin. This is what makes them hard and strong. The hormone estrogen helps to produce keratin so when levels decline, your nails may become more brittle, soft, or crack and split more easily.

One of the main reasons for this shift is the decline in estrogen that happens as we get older. ... When estrogen levels drop, your nails can become drier and more prone to breaking, just like your skin might start to feel rougher or more sensitive. Without enough estrogen, the keratin in your nails, the protein that gives them strength, becomes more fragile. ... Declining estrogen and thyroid hormones mean nails grow slower and may become thinner.

Women’s wellness brand article states: "Similarly to how estrogen nourishes hair and skin, this beauty-promoting hormone also helps our nails grow strong and healthy by keeping them hydrated. Hydrated nails are healthy nails, and estrogen helps to maintain water in body tissues, and therefore, lower estrogen levels can lead to dull, yellow nails that are more prone to breakage." It further notes: "Hormonal imbalances can have a significant impact on nail health, causing brittle nails, slow growth, and changes in texture. Estrogen, for example, helps maintain nail moisture and flexibility. Lower estrogen levels can lead to dry, brittle nails that are more prone to breakage. Similarly, during menopause, declining estrogen levels can result in increased nail brittleness and slower growth."

As estrogen declines in midlife, hydration and collagen production drop. Nails may become thinner, flakier, or slower-growing — often alongside brain fog, irregular cycles, or mood swings. ... Estrogen, thyroid, and stress hormones all play major roles in keratin production, hydration, and blood flow — which impact nail health.

Claire notes the effect of menopause on nail health, commenting: “Declining oestrogen levels reduce collagen production and impair moisture retention in skin, hair and nails, which can make nails grow more slowly, become brittle and split or peel more easily. ... Research has shown that around 66% of women experience brittle nails during menopause. This is likely linked to low oestrogen levels impacting keratin production.”

Estrogen helps maintain hydration and flexibility in nails by supporting collagen and keratin structure. That is why many women notice nails becoming more brittle or dry during menopause, when estrogen levels drop.

As estrogen levels decline, the production of collagen and keratin decreases. The resulting nail plate has reduced tensile strength, grows more slowly, and is more susceptible to surface damage. Women in menopause typically notice that nails grow more slowly and that damaged nails take longer to grow out.

But here’s the nuance: more estrogen doesn’t mean ‘faster-growing’ nails in the way we imagine — it means better-quality growth: thicker, less brittle, more cohesive plates with improved moisture retention in the nail bed. ... Myth #1: “More estrogen = longer nails.” False. Estrogen improves nail quality, not linear growth speed. Growth rate is genetically determined and largely fixed after age 25. What changes is structural integrity — so nails survive longer before breaking, creating the illusion of faster growth.

Estrogen levels begin to fluctuate during perimenopause before steadily declining. Because this key hormone is responsible for regulating tissue hydration, keratin, and collagen levels, nails are affected as well; dry, brittle nails are associated with lower estrogen levels during menopause.

Higher estrogen levels and improved blood circulation during pregnancy stimulate nail matrix activity. As a result, nails grow faster and look healthier. A decrease in estrogen levels affects hydration and tissue elasticity, making nails fragile and less likely to grow quickly.

Research suggests that oestrogen encourages collagen production and boosts cholesterol content in the nail plate. After menopause, oestrogen levels drop, leading to brittle nails. This decrease in oestrogen is also described as causing a decrease in keratin levels, which may make fingernails weak and brittle.

This page states that lower estrogen levels can contribute to dull, yellow nails that are more prone to breakage, while rapid nail growth is associated with pregnancy, when estrogen and progesterone are highest.