The Nioxin System 4 Duo 300ml Shampoo and Conditioner has two products: the Nioxin System 4 Cleanser Shampoo and the Nioxin System 4 Scalp Revitalizer Conditioner.
The first product from the duo is the Nioxin System 4 Cleanser Shampoo. It is the perfect choice for those who have bleached and chemically treated hair with light thinning. The System 4 Cleanser Shampoo is also great for hair strengthening and hair structure amplification. It will prepare your hair and scalp for the ideal thickening treatment. Furthermore, it does a great job at removing dirt, excessive oil, and various other environmental residues from your hair. Here is how to ideally use the System 4 Shampoo.

Gently apply it onto damp hair and scalp
Rinse the shampoo into your hair well
Work it into a lather for a minute.
Rinse your hair thoroughly and use the System 4 shampoo daily with other products from the Nioxin System 4 for maximum results.

Here are some best benefits of the System 4 Shampoo.

Prepares the hair and scalp for thickening
Best to use for natural hair with light thinning
This shampoo has peppermint oil that helps to refresh your scalp after the first application
The shampoo enables you to obtain the maximum results when you use the shampoo with the other products from the system

The Nioxin System 4 Scalp Revitalizer Conditioner is the second product from the list, which is perfect for normal to thin, medium to coarse, or natural to colored hair. Whatâ€™s great about this conditioner is that it makes the hair resilient, and it will also help control the moisture balance for normal and thin hair. Here is how to use this conditioner.

After shampooing, distribute the conditioner onto the scalp and hair
Leave the conditioner on your hair for a few minutes before washing your hair

Here are some characteristics of the System 4 Conditioner.
Great to use for normal, thin, medium, coarse, natural, and colored hair
Increase the resiliency of the hair
Controls the hair moisture balance