I add water to my shampoo to make it last longer. Will it clean as well?

Gideon Lupine Ask Dr. Moss

Question

I add water to my shampoo to make it last longer. Will it clean as well?

Answer

If it’s a concentrated shampoo that really lathers up (and takes a lot of water to rinse out), there’s no harm in adding water, says New York City dermatologist Doris Day. A nonsudsy shampoo could become too watered down to remove oils.