Thinning Eyebrows: Why Brows Get Sparser and How to Care for Them

Thinning Eyebrows: Why Brows Get Sparser and How to Care for Them

Full brows frame the face, so it is easy to notice when they start looking sparse. Years of plucking, the passage of time, or simply the natural shape of your brows can all play a part.

Why the tail thins first

Your eyebrow is not uniform. A study that measured hair density and thickness across the brow found that the tail, the outer third, has the lowest baseline hair density and the finest hairs, and that growth patterns vary across the brow, with the tail the most distinct part (Suchonwanit and Thammarucha, 2020, PMID 31541563). That is a large part of why the outer tail is usually the first place a brow starts to look thin.

What makes brows sparser over time

Repeated plucking and waxing over many years can leave hairs slower to return. Hair also tends to grow finer with age, and everyone sheds and regrows hair in cycles. If you notice sudden or patchy brow loss rather than a gradual thinning, that is worth mentioning to your doctor, since it can have medical causes.

About conditioning serums

Brow and lash conditioning serums are popular, and it is worth knowing what is in them. A 2026 analysis of 79 eyelash serums, the category most of these products fall into, found that roughly 30 percent contained prostaglandin-analogue compounds, which are not regulated for use in cosmetic products, while the rest were formulated with gentler ingredients such as castor oil, amino acids, panthenol and peptides (Couteau and Coiffard, 2026, PMID 42269767). A separate review of prostaglandin-analogue eyelash products noted that the safety picture has gaps, including under-reported application discomfort and effects around the eye (Steinsapir and Steinsapir, 2021, PMID 33625141). The sensible approach is to read the ingredient list, patch test a new serum, and understand the trade-offs before you start.

Everyday brow care

  • Ease off the tweezers. Once brow hair is over-plucked it can be slow to come back.
  • Be patient. Brow hair grows slowly, so give any change several weeks before you judge it.
  • A tinted brow gel fills gaps and shapes the brow for an instantly fuller look, no waiting required.
  • If you choose a conditioning serum, patch test it first and use it consistently.

At Verdo we stock the RevitaBrow Advanced Eyebrow Conditioner, the RevitaLash Hi-Def Tinted Brow Gel for shaping and filling, and the RevitaLash Advanced Eyelash Conditioner for lashes.

Disclaimer: This article is for general information only and is not medical advice. The studies cited are from peer-reviewed journals and are provided for educational context. Individual results vary. Speak with a qualified healthcare professional or dermatologist before changing your routine. Verdo Cosmetics makes no therapeutic claims about the products or services mentioned.

Frequently asked questions

Why are my eyebrows getting thinner?
Brows commonly thin from years of plucking or waxing, from hair growing finer with age, and from normal shedding cycles. Research also shows the outer tail of the brow naturally has the lowest hair density, so it tends to look sparse first (Suchonwanit and Thammarucha, 2020). Sudden or patchy loss is worth checking with a doctor.
Do brow conditioning serums work?
It depends on the formula. A 2026 analysis of eyelash serums, the category most of these products fall into, found about 30 percent contain prostaglandin-analogue compounds that are not regulated for cosmetic use, while the rest use gentler ingredients like castor oil, peptides and panthenol (Couteau and Coiffard, 2026). Read the label, patch test, and use any serum consistently.
Are prostaglandin brow serums safe?
A review of prostaglandin-analogue eyelash products found the safety information has gaps, including under-reported application discomfort and effects around the eye (Steinsapir and Steinsapir, 2021). If a serum contains one of these ingredients, understand the trade-offs first and speak to a professional if you have any eye conditions.
How can I make sparse brows look fuller now?
A tinted brow gel fills gaps and defines the shape immediately, no waiting for regrowth. Longer term, ease off over-plucking, be patient with any conditioning routine, and give brow hair several weeks to respond before judging.
Back to blog

Keep reading