NOW Foods is recalling products containing whey protein concentrate because of possible Salmonella contamination, the U.S. Food and Drug Administration said.

The voluntary recall of 12 products and 29 lots is an extension of the recall being conducted by NOW supplier Plainview Milk Products Cooperative, FDA officials said in a release Friday.

The products being recalled include Strawberry Whey Protein, lot 1125277; Vanilla Whey Protein Economy, lot 1066010 and Vanilla Whey Protein with Glutamine, lot 1104205. Customers can return the products to the store where purchased for a full refund,

For questions, call NOW Foods at 1-888-NOWFOODS (1-888-669-3663).

Salmonella can cause serious and sometimes fatal infections in children, the elderly and people with compromised immune systems. Symptoms include fever, diarrhea, nausea, vomiting and stomach pain.