What are the main food sources of beta-alanine/carnosine?

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Beta-alanine (carnosine) can only be obtained by consuming animal products. The primary sources of dietary beta-alanine include beef (1,500 ug–2,000 µg per gram), pork (2,400 µg per gram), poultry (700 µg/µgram), chicken broth, and fish.[1][2][3]

Though food can be a good source of beta-alanine, obtaining the recommended dose of 3.2–6.4 grams/day through diet alone could be difficult. For instance, you would need to consume 2 lb (0.9 kg) of chicken breast, 2.5 lb (1.1 kg) of beef, or 3.4 lb (1.5 kg) of pork to obtain 3.2 grams of beta-alanine.

1.^Yeum KJ, Orioli M, Regazzoni L, Carini M, Rasmussen H, Russell RM, Aldini GProfiling histidine dipeptides in plasma and urine after ingesting beef, chicken or chicken broth in humans.Amino Acids.(2010-Mar)
2.^Gil-Agustí M, Esteve-Romero J, Carda-Broch SAnserine and carnosine determination in meat samples by pure micellar liquid chromatography.J Chromatogr A.(2008-May-02)
3.^Abe H, Dobson GP, Hoeger U, Parkhouse WSRole of histidine-related compounds to intracellular buffering in fish skeletal muscle.Am J Physiol.(1985-Oct)