Lifeline's wild caught tuna oil and wild Alaska pollock oil are combined to provide their highest levels of Omega fatty acids. Tuna oil contains one of the highest levels of DHA of any marine fish and, for that reason, is typically used for manufacturing baby formula. Wild Alaska pollock, a cousin of the cod, is an excellent source of Omega-3 EPA. These ultra-high levels of Omega-3 make Lifeline Wild Tuna & Alaska Pollock Oil good for young or pregnant pets. DHA is an important structural component in the brain and can make a puppy more responsive to training.