Portuguese to English Science Cosmetics, Beauty Shampoo Label

"A composição da fórmula numa ***base de baixo*** teor alcaólico, tonifica e auxilia no controle da secreção sebácea sem agredir o couro cabeludo."

From a shampoo label. I truly have no idea what a "base de baixo" is. The package has a Spanish translation of the Portuguese, and in case it's of any good to anyone, here's what the Spanish version says:

"La composición de la fórmula en una ***base de bajo*** contenido alcohólico, tonifica y ayuda en el control de la secreción sebácea sin agredir del cuero cabelludo."

The Spanish "base de bajo" is equally mystifying to me. Eurodicautom (when it deigns to work) has been no help. Hope someone here can be. TIA for any light you can shed on it.