Our top pick for the best overall hair growth conditioner is the Redken Extreme Length Conditioner. This formula is enriched with amino acids, citric acid, and arginine, which blend together to ward off all types of damage — including more extreme situations — while also providing an ideal environment for hair growth.

How does deep conditioning work? It gives your hair a big hit of moisture or protein, helping to strengthen your hair at the cuticle. A mask can reduce breakage and split ends, improve elasticity, and keep your hair healthy.

Unlike regular conditioners, deep conditioners should sit on your hair anywhere between 15 and 30 minutes. But be careful, leaving your deep conditioner in for an elongated period of time too often can cause you to over-condition your hair. And as a result, you can cause your hair to become weak and fragile.