Yes. Our products are developed based on carefully selected ingredients.

Nature Eva products do not irritate the skin and they do not contain harmful substances such as carbocysteine, formaldehyde.

Product pH is 1.5 and the pH of the skin is 7. if there are any cuts or other lesions on the skin, the product could cause burning sensation. However, the product does not sting the eyes or cause irritation to the respiratory system.

  •  Straightening iron  
  • Bio Straight cleansing shampoo
  • Bio Straight Straightening Treatment
  • Application brush to apply the product
  • A comb
  • Hair dryer

It can be applied, as long as the hair is healthy and passes the strand test. If hair was previously  treated with chemicals such as guanidine we do not recommend treatment.

3 to 6 hours depending on the length and volume of the hair.

There is no need to straighten hair before. Bio Straight will straighten hair 100%

YES, this treatment is unisex. 

Allow at least 120 days, as the root will have grown and will need to be touched up. But if necessary, It can be used WHENEVER you want. 

Conts us if you have any doubts or alternatively apply only on one strand to check the results and wait for few days before applying it to all hair.

YES, for colored hair there will be a colour change, especially blonde hair. To minimize the colour change, rinse the hair a bit more and use the straightener at low temperature  180 – 190.

Colouring the hair should be done AFTER the treatment. 

Moisturize your hair at least once a week. 

Depending on how it was applied and the state of the hair, it can last 5 to 7 months. 

The hair should be washed at the salon, we recommend to use the maintenance kit because after  the treatment maintenance kit balances the pH of the hair. 

NO, if the hair is not straight, reapply  the product. Remember DO NOT RINSE the product, just wet the hair. 

We do not recommend as Henna usually contains lead. This is not compatible with amino acids and can damage the hair. 

All types of hair, regardless of their condition and whether it was dyed, treated with chemical excluding GUANIDINE.

Yes, you can have a normal life at the beach or pool. However, the treatment may not last as long. We recommend using sunscreen for the hair and never leave chlorine or salt in the hair. Wash the as soon as you leave the beach or pool.