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Natural Ingredients

Natural Ingredients

Sulphate & Paraben Free

Sulphate & Paraben Free

Gentle Cleansing

Gentle Cleansing

Nourishment & Hydration

Nourishment & Hydration

Natural Ingredients

Natural Ingredients

Sulphate & Paraben Free

Sulphate & Paraben Free

Gentle Cleansing

Gentle Cleansing

Nourishment & Hydration

Nourishment & Hydration

Natural Ingredients

Natural Ingredients

Sulphate & Paraben Free

Sulphate & Paraben Free

Gentle Cleansing

Gentle Cleansing

Nourishment & Hydration

Nourishment & Hydration

Natural Ingredients

Natural Ingredients

Sulphate & Paraben Free

Sulphate & Paraben Free

Gentle Cleansing

Gentle Cleansing

Nourishment & Hydration

Nourishment & Hydration

Bio Sleek

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Bio Sleek

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Permanent Organic Hair Straightening Treatment
Powerful. Washable. Formaldehyde-Free.

The ultimate solution for straightening curly, colored, and coarse hair without fumes or harsh chemicals.
For licensed professionals only.


Rich with Natural Ingredients

Rich with Natural Ingredients

Formaldehyde Free

Formaldehyde Free

Suitable for All Hair Types

Suitable for All Hair Types

Hair Doesn’t Get Affected by Swimming or Sports

Hair Doesn’t Get Affected by Swimming or Sports

Free and fast shipping in the USA
100% Secure payments
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Nano lamination

Why Hairstylists Love Bio Sleek

Fume-Free & Formaldehyde-Free
No smoke, no eye irritation, no dangerous chemicals — just a clean, safe environment for you and your clients.

100% Washable Treatment
The product is fully rinsed out before blow-drying and flat ironing. No buildup, no stickiness, no surprises.

Permanent Results
Straightens hair up to 99%, even on curly and color-treated textures. Only the roots need touch-ups every 6–12 months.

One-Time Correction Option
If any areas stay wavy after the first wash, simply pass the flat iron again — no need to reapply the treatment.

Who is it for?

  • Hairstylists working with curly, thick, or frizzy hair
  • Clients with colored hair up to level 7
  • Professionals looking for long-lasting straightening without chemicals
  • Safe for pregnant women and kids (10+)

Frequently Asked Questions