Ammonium lactate is a compound with formula NH4(C2H4(OH)COO).

It is the ammonium salt of lactic acid.

It has E number "E328" and is the active ingredient of the skin lotions Amlactin and Lac-Hydrin.

Those who are using it should avoid exposure to sunlight or artificial UV rays, such as sunlamps or tanning beds.

[2] Ammonium lactate is sold as an over-the-counter medication Amlactin brand used for treating xerosis.