"Oil is the food of hair" – this is an old Ayurvedic saying. Interestingly, this millennia-old practice aligns with today's high-performance lifestyle. Dry hair is not just a beauty issue; it is a functional one: Those suffering from brittle ends and a dull structure often struggle with friction losses in everyday life – more time for styling, less protection from UV, and higher susceptibility to breakage. The good news: Scientifically verified strategies can stabilize the internal water balance of hair. And they are surprisingly practical for everyday use.

Dryness occurs when the Cuticleprotective outer layer of the hair no longer closes tightly and moisture diffuses out of the Cortexfibrous, protein-rich core of the hair. Moisture here does not mean "wet" hair, but bound water within the hair matrix. Crucial is the Diffusion Barrierlayer that slows down water transport, which regulates the equilibrium with the environment. Oils can partially reinforce this barrier, while UV radiation, strong chemicals, and mechanical stress weaken it. Important: Hair is dead keratin – it does not regenerate. Therefore, prevention and gentle care are more effective than later attempts at repair.

For high performers, robustness counts. Dry, porous fibers lose shine and elasticity, break more easily, and become statically charged – increasing styling time, friction, and stress. Mechanically, this is reflected in more fiber breakage, especially when hair is brushed while wet; this is precisely when the proportion of long break segments increases, further intensifying visible thinning ^[1]. Environmental stress, such as UV radiation, accelerates protein breakdown and oxidative damage to the cuticle, leading to poorer water retention and reduced mechanical strength ^[2]. Chemical hair treatments can additionally affect the structure and physical properties of the hair shaft – from cuticle roughening to altered water absorption – thus exacerbating dryness ^[3].

Current material research demonstrates how natural oils influence the moisture balance of hair. In a study involving dynamic water vapor absorption, oil-treated hair exhibited lower water vapor diffusion coefficients compared to untreated hair – the oil films acted as a diffusion barrier and thus slowed moisture loss, an effect similar to "moisturization." Coconut oil showed advantages over mineral oil, and at low humidity, oil-treated samples retained slightly more residual moisture ^[4]. Clinically relevant for hair quality is also systemic nutrient supply: In a randomized, double-blind, placebo-controlled study over 90 days, plant-based biotin supplementation, with or without silica, significantly reduced hair loss and accelerated hair growth, accompanied by improved skin and nail parameters; no adverse events occurred ^[5]. In parallel, photoprotection research opens new avenues: A bio-derived melanoidin/tannic acid complex formed a strong-adhesion, antioxidant-active UV protection layer on hair fibers, stabilized the cuticle, increased tensile strength, and modulated cellular stress responses, which reduced UV-induced damage ^[2]. Taken together, these studies demonstrate that surface protection, nutrient optimization, and UV protection work complementarily against dryness and structural loss.

- An oil film as a moisture barrier: 2–3 times per week, work a few drops of natural-based oils (e.g., coconut or argan oil) into lengths and ends, preferably on slightly damp hair. This creates a diffusion barrier that measurably slows moisture loss ^[4].
- Smart pre-wash: Before shampooing, let a light oil sit for 30–60 minutes. This reduces swelling stress on the fibers and protects the cuticle – especially in dry climates ^[4].
- Supplement with a system: Test biotin (approx. 1.25 mg/day) – optionally in combination with silica – over 90 days. Goal: less hair loss, improved growth dynamics, indirectly more volume and moisture retention of the total hair mass ^[5]. Check with a physician for pre-existing conditions.
- UV is the invisible dehydrator: In strong sunlight, use a hat, UV protection spray, or leave-in products with an antioxidant component. New bio-inspired coatings show significant protection of the cuticle and fibers against UV-induced oxidative stress ^[2].
- Mitigating mechanics: Do not brush wet hair. If necessary, use a wide-tooth comb, with short strokes, and conditioner slip. This reduces long break segments that visibly thin the hair ^[1].
- Chemistry with foresight: Color less frequently, choose gentle techniques, and use professional bond builders. This minimizes structural damage and thus secondary dryness ^[3].

The next generation of hair care combines diffusion physics, micronutrients, and photoprotection. In the coming years, we will see more bio-inspired coatings, more precise oil formulations, and personalized supplement protocols that measurably stabilize the moisture balance of hair. Those who protect consistently and nourish specifically today will benefit tomorrow from resilient, high-performance hair.