High Quality Content by WIKIPEDIA articles! Calcium stearoyl-2-lactylate (calcium stearoyl lactylate or CSL) is a versatile, FDA approved food additive. CSL is non-toxic,biodegradable, and typically manufactured using biorenewable feedstocks. Because CSL is a safe and highly effective food additive, it is used in a wide variety of products from baked goods and desserts to packaging.