Potassium lactate
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The potassium salt of lactic acid (E270).

It is hygroscopic and used in such products as sponge cakes and Swiss rolls where its ability to absorb moisture helps to retain the moisture content and thereby extend shelf-life.

It is also used for its synergistic effect on other substances antioxidant effect.

Found in sponge cakes and Swiss rolls, ice cream, jams, jellies, marmalades and sweets.

Vegetarians should be aware that as the source, E270, Lactic acid, is a naturally occurring animal product it could conceivably be of animal origin.