The Power of Ingredients: Keratin, L-Cystine and Biotin

Belène® Hair combines keratin, L-cystine and biotin, the natural building blocks of strong hair, in a clinically proven formula.

Strong, shiny and healthy hair starts with the right ingredients. Not with a mask or a serum, but with what happens inside your body. Every hair you see is the result of a complex biological process in which hundreds of cells, proteins and vitamins work together. And this is precisely where science makes the difference.

Why Ingredients Matter

In the world of hair care, many promises are made: serums that claim to make your hair thicker, oils that accelerate growth, or keratin treatments that supposedly “repair” your hair. But the truth is simple: the hair you see is dead tissue. What truly matters is what happens in the hair root.

The hair root is a living mini-organ that continuously produces new cells. This is where the building blocks of your hair are formed, mainly keratin, a protein that makes up more than 90% of your hair’s structure.

For this process to function properly, your body needs a constant supply of amino acids, vitamins and minerals. And that is exactly what Belène® Hair PRO Capsules provide: a scientifically balanced combination of keratin, L-cystine and biotin.

What Is Keratin?

Keratin is the main structural protein in hair, nails and skin. It gives your hair its strength, resilience and shine. Each hair consists of three layers: the cuticle (outer layer), the cortex (fiber layer) and the medulla (core). The cortex, which makes up about 80% of the hair’s volume, is composed mainly of keratin fibers twisted together like a cable.

When the keratin structure is damaged, for example by:

• heat from straighteners or hairdryers,
• chemical treatments such as coloring or relaxing,
• UV radiation, salt water or chlorine,

the hair loses its shine and elasticity and breaks more easily.

A keratin product such as Belène® Hair PRO Capsules restores that balance from within. The capsules contain 500 mg of naturally derived keratin peptides that are smaller than standard keratin and therefore easily absorbed.

These peptides provide the exact amino acids the body needs to strengthen and repair the hair structure from within, instead of offering only temporary surface shine.

What Does L-Cystine Do?

L-cystine is a sulfur-containing amino acid that plays a key role in the production of keratin. It forms the so-called disulfide bridges, the bonds that tightly connect keratin fibers. Without enough L-cystine, these bonds weaken, causing hair to become thinner, more brittle and fragile.

Studies show that supplementation with L-cystine (often in combination with other nutrients) increases hair density, boosts the number of hairs in the anagen (growth) phase and improves overall hair quality in certain groups of people.

L-cystine naturally occurs in protein-rich foods such as eggs and legumes, but the amount absorbed through diet is not always sufficient to reach the hair root, especially during periods of stress or hormonal change.

A daily intake of 150 mg of L-cystine, as found in Belène® Hair PRO Capsules, supports natural keratin production and helps achieve stronger, thicker hair that breaks less easily.

Biotin: The Vitamin That Supports Hair Growth

Biotin, also known as vitamin B8 or vitamin H, is essential for healthy hair growth. It plays a crucial role in the energy metabolism of hair cells and in the production of keratin.

A deficiency in biotin can lead to:

• hair loss,
• brittle nails,
• dull skin or lackluster hair.

Since the body does not store biotin, it must be replenished daily through food or supplements.

Belène® Hair PRO Capsules contain a scientifically balanced dose of biotin that helps maintain strong hair (hair vitamin biotin) and supports natural hair growth.

The Synergy of Ingredients

What makes Belène® Hair unique is the scientific combination of keratin, L-cystine and biotin, three substances that enhance each other’s effectiveness.

• L-cystine provides the building blocks needed to form keratin.
• Keratin peptides deliver these building blocks directly to the hair root.
• Biotin optimizes cellular metabolism in the hair follicle so these nutrients can be effectively used.

The result is a synergistic effect: stronger hair, more shine and increased hair density.

Clinical Studies Show

The effects of keratin peptides on hair have been extensively studied in a 90-day double-blind, placebo-controlled clinical trial involving 50 women with visibly damaged hair (Beer et al., 2014).

Results after 90 days:

• 46.6% less hair loss
• 9.2% increase in anagen hairs (growth phase)
• 5.9% improvement in hair strength
• 47.1% more shine
• 88% of participants reported that their hair felt stronger
• 95% noticed more shine after just 30 days

A second study (Nobile et al., 2019) also showed that L-cystine supplementation in women with telogen effluvium resulted after 90 days in a significant improvement in hair strength and reduced hair loss.

The formulas of Belène® Hair PRO Capsules are based on these clinical findings:

a daily intake of keratin peptides, L-cystine and biotin supports the hair structure, reduces hair loss and visibly improves shine and resilience within 90 days.

The result is hair that not only feels healthier but also becomes visibly stronger, shinier and fuller.

Conclusion: Science + Beauty = Belène® Hair

Strong, shiny and healthy hair starts from within.

While many hair products work only on the surface, Belène® Hair is rooted in science and biology.

Belène® Hair PRO Capsules combine the power of three essential ingredients:

• Keratin for structure and strength
• L-cystine for keratin production and resilience
• Biotin for vitality and healthy growth

The formula works in synergy to nourish hair from root to tip.

After 90 days, the difference is not only tangible but also visible: fuller, shinier and stronger hair, scientifically proven.

💚 Belène® Hair PRO Capsules: where science and beauty meet.