Natural Farm presents Collagen Sticks. These collagen chews promote joint, skin, coat and digestive health in a fully digestible chew. The company only uses the best ingredients, and the collagen sticks last 20% longer than bully sticks, the company states. The chews are non-GMO and grain free. The company also offers Gourmet Collagen Sticks, irresistible collagen chews for dogs that need a more durable chew stick.