This duo from Nioxin consists of two products, which are the Nioxin System 4 Cleanser Shampoo and the Nioxin 4 Scalp Revitalizer Conditioner.

The Nioxin System 4 Cleanser Shampoo is suitable for bleached and chemically treated hair with light thinning. Additionally, it helps with hair strengthening and the amplification of the hair structure. The System 4 Cleanser Shampoo from Nioxin prepares your hair and scalp for a thickening treatment. It does its best to get rid of dirt, excessive oil, and various other environmental residues from your hair. Here is how to use the Nioxin System 4 Cleanser Shampoo.

Gently massage it onto wet hair and scalp
Work it into a lather for a minute and let it rest for a while
Rinse your hair thoroughly
This shampoo can be used daily with other products from the Nioxin System 4 for maximum results
Here are some features of the System 4 Cleanser Shampoo shampoo.

It makes the hair and scalp ready for a thickening treatment
Ideal to use for natural hair with light thinning
The Cleanser Shampoo contains peppermint oil that refreshes your scalp after the first application
Use the shampoo with the other products from Nioxin System 4 for optimum results

The Nioxin System 4 Scalp Revitalizer Conditioner is the second product from the duo, and it is suitable for normal to thin, medium to coarse, or natural to colored hair. It increases the resiliency of the hair, and it will also help in controlling the moisture balance for normal and thin hair. Here is how to use the Nioxin System 4 Scalp Revitalizer Conditioner.
Apply the conditioner after shampooing to wet hair
Massage it and let it stay for a few minutes before rinsing it off
Here are the characteristics of this product.
Ideal for applying on normal, thin, medium, coarse, natural, and colored hair
Improves the resiliency of the hair and maintains the moisture balance of normal and thin hair