Cystine: Essential benefits for hair, skin and nails : Your online pharmacy selection

What is cystine and why is it essential?

Cystine is a sulfur-containing amino acid essential to the body's proper functioning. It is formed by the association of two molecules of cysteine, another amino acid found in proteins. This compound plays a crucial role in the synthesis of keratin, the main protein in hair, nails and skin.

Cystine also contributes to the production of glutathione, a powerful antioxidant that protects cells against oxidative stress and free radicals. Thanks to its structural and protective properties, this amino acid is a key element in maintaining strong hair, strong nails and radiant skin.

What are the benefits of cystine for hair?

Cystine is particularly renowned for its beneficial action on hair. It acts on several levels:

1. Accelerating hair growth: By promoting the production of keratin, it stimulates hair growth and improves hair density.
2. Strengthening hair fiber: Its high sulfur content fortifies hair, making it more resistant to external aggression and breakage.
3. Reduced hair loss: A course of cystine can help curb seasonal or reactive hair loss due to stress, fatigue or nutritional deficiencies.
4. Improved hair shine and texture: By restructuring the hair fiber, cystine helps hair regain its natural shine and suppleness.

How does cystine affect nails and skin?

Cystine isn't limited to hair. It is also valuable for nail strength and skin health.

• Strengthening nails: It stimulates nail growth, making them harder, less brittle and more resistant to impact.
• Preserves skin elasticity: By intervening in the formation of collagen and keratin, it helps maintain toned, supple skin.
• Antioxidant action: By participating in the production of glutathione, cystine protects the skin against premature aging and external aggressors such as pollution and UV rays.

Which foods are rich in cystine?

Cystine is naturally present in many foods rich in animal and plant proteins. Here are the main sources:

• Lean meats: chicken, turkey, beef
• Fish and seafood: salmon, tuna, shrimp
• Eggs: yolks are particularly rich in protein
• Dairy products: cheese, yoghurt, milk
• Pulses: lentils, chickpeas, kidney beans
• Whole grains: oats, quinoa, brown rice
• Nuts and seeds: almonds, Brazil nuts, sunflower seeds

A varied, balanced diet generally covers cystine requirements, but certain situations may call for supplementation.

Why take a cystine-based dietary supplement?

A cystine cure is often recommended in a number of cases:

• Excessive hair loss or weakened hair
• Soft, brittle or ridged nails
• Dull, tired skin
• Nutritional deficiencies linked to an unbalanced diet or a strict vegetarian diet
• Periods of stress or intense fatigue that affect hair and nail quality

Dietary supplements combining cystine with biotin, zinc and B vitamins are particularly effective in strengthening hair fiber and improving the quality of nails and skin.

How long does a cystine cure last?

To achieve visible results, a cystine cure must be followed for at least three months. This period corresponds to the natural hair renewal cycle, which enables the benefits of the treatment to be appreciated in terms of hair growth and nail strengthening.

Does cystine have side effects?

Cystine is well tolerated by the body when consumed in normal proportions. However, excessive intake can lead to certain side effects:

• Digestive disorders: bloating, intestinal discomfort, mild diarrhoea
• Sulfur overload: excessive consumption of sulfur can lead to joint pain.
• Drug interactions: some people on specific medication should seek medical advice before starting a course of treatment.

Respecting recommended dosages is essential to avoid any imbalance and fully benefit from cystine's advantages.

Is cystine suitable for everyone?

Most adults can consume cystine. However, certain precautions should be taken:

• Pregnant and breast-feeding women: it's best to consult a health professional before taking a supplement.
• People with kidney or liver disease: taking too much cystine can overload these organs.
• Children and teenagers: although cystine is a natural amino acid, its use in supplementation should be supervised by a professional.