Here are some of the scientific research papers on A2 vs A1 milk.. not sure how you could have missed all these?
Review articles related to beta-casein & milk protein
Milk Intolerance, Beta-Casein and Lactose Pal S, Woodford K, Kukuljan S, Ho S, Nutrients. (2015). 7(9), 7285-97.
Beta casein A1 and A2 in milk and human health. Report to New Zealand Food Safety Authority Swinburn B, (2004). Prepared for New Zealand Food Safety Authority, July, 2004.
Scientific Report of EFSA prepared by a DATEX Working Group on the potential health impact of ß-casomorphins and related peptides EFSA Scientific Report (2009). 231, 1-107.
The A2 milk case: a critical review Truswell A.S, (2005). Eur J Cln Nutr. 59(5), 623-31.
A critique of Truswell’s A2 milk review Woodford K.B, (2006). Eur J Clin Nutr. 60(3), 437-9.
Further research for consideration in ‘the A2 milk case’ Allison A.J, Clarke A.J, (2006). EurJ Clin Nutr. 60(7), 921-4.
Formation and Degradation of Beta-casomorphins in Dairy Processing Nguyen D.D, Johnson S.K, Busetti F, Solah V.A, Crit Rev Food Sci Nutr. (2015). 55(14), 1955-67.
Polymorphism of bovine beta-casein and its potential effect on human health Kaminski S, Cieslinska A, Kostroyra E, (2007). J Appl Genet. 48(3), 189-98.
Health implications of milk containing beta-casein with the A2 genetic variant Bell S.J, Grochoski G.T, Clarke A.J, (2006). Crit RevFood Sci Nutr. 46(1), 93-100.
Caseins as source of bioactive peptides Silva S.V, Malcata F.X, (2005). International Dairy Journal (15): 1-15.
Functional Significance of Bioactive Peptides Derived from Milk Proteins Kamauab S.M, Lua R, Chena W, Liua X, Tiana F, Shena Y, et al. (2010). Food Reviews International 26(4): 386-401.
Opioid peptides encrypted in intact milk protein sequences. Meisel H & FitzGerald R.J, (2000). Br J Nutr. 84 Suppl 1, S27-31.
Opioid activities of beta-casomorphins Brantl V, Teschemacher H, Blasig J, Henschen A, Lottspeich F, (1981). Life Sci. 28(17),1903-9.
Effects of milk-derived bioactives: an overview Shah N.P, (2000). Br J Nutr. 84 Suppl 1:S3-10.
Heart Disease, Diabetes, Gut Immune Suppression and Epidemiology Studies McLachlan C.N.S & Clarke A.J, (2002). Journal of Nutritional & Environmental Medicine, 12(3), 197-206.
Casein, a prohormone with an immunomodulating role for the newborn? Migliore-Samour D & Jolles P, (1988). Experientia. 44(3), 188-93.
Casein-derived bioactive peptides: Biological effects, industrial uses, safety aspects and regulatory status. Phelan M, Aherne A, FitzGerald R.J, O’Brien N.M, (2009). International Dairy Journal. 19, 643-54.
Latent bioactive peptides in milk proteins: proteolytic activation and significance in dairy processing Gobbetti M, Stepaniak L, De Angelis M, Corsetti A, Di Cagno R, (2002). Crit Rev Food Sci Nutr. 42(3):223-39.
Beta-casein in cow’s milk: a major antigenic determinant for type 1 diabetes? Pozzilli P, (1999). J Endocrinol Invest. 22(7), 562-7.
Milk A1 and A2 peptides and diabetes Clemens R.A, (2011). Nestle Nutr Workshop Ser Pediatr Program. 67:187-95.
Intestinal assimilation of intact peptides and proteins from the diet–a neglected field? Gardner M.L, (1984). Biol Rev Camb Philos Soc. 59(3):289-331.
Behavioral effects of food-derived opioid-like peptides in rodents: Implications for schizophrenia? Lister J, Fletcher PJ, Nobrega JN, Remington G. Pharmacology, biochemistry, and behavior. (2015). 134:70-8.
Gluten- and casein-free diets for autistic spectrum disorder (Review) Millward C, Ferriter M, Calver S, Connell-Jones G, (2008). Cochrane Database Syst Rev. 16;(2):CD003498
. Reports on dietary intervention in autistic disorders Knivsber A.M, Reichelt K.L, Nødland M, (2001). Nutritional neuroscience. 4(1):25-37.
Biochemical aspects in autism spectrum disorders: updating the opioid-excess theory and presenting new opportunities for biomedical intervention Shattock P, Whiteley P, (2002). Expert Opin Ther Targets. 2002;6(2):175-83.
Can the pathophysiology of autism be explained by the nature of the discovered urine peptides? Reichelt K.L, Knivsberg A.M, (2003). Nutritional neuroscience. 6(1):19-28.
Opioid peptides and dipeptidyl peptidase in autism Shattock P, Hooper M, Waring R, (2004). Dev Med Child Neurol. 46(5):357.
Gluten-Free and Casein-Free Diets in the Treatment of Autism Spectrum Disorders: A Systematic Review Mulloy A, Lang R, O’Reilly M, Sigafoos J, Lancioni G, Rispoli M, (2010). Research in Autism Spectrum Disorders. 4(3):328-39.
Minireview. Peptides and the blood-brain barrier Meisenberg G, Simmons W.H, (1983). Life Sci. 32(23):2611-23.
Saturable transport of peptides across the blood-brain barrier. Banks, W. A & Kastin A. J, (1987). Life Sci. 41(11): 1319-38.
Effects of peptides on animal and human behavior: a review of studies published in the first twenty years of the journal Peptides McLay R.N, Pan W, Kastin A.J, (2001). Peptides. 22(12):2181-255.
The role of respiratory failure caused by congenital central nervous system abnormalities and the effect of beta-casomorphins in sudden infant death syndrome pathogenesis Suminska-Ziemann B, Gos T, Jankowski Z, (2015). Arch Med Sąd Kryminol. 65(2), 99-111.
Sudden infant death syndrome and opioid peptides from milk. Ramabadran K & Moore B.E, (1988). Am J Dis Child. 142(1):12-3.
Opioid peptides from milk as a possible cause of sudden infant death syndrome Ramabadran K & Bansinath M, (1988). Med Hypotheses. 27(3):181-7.
Relation of beta-casomorphin to apnea in sudden infant death syndrome Sun Z, Zhang Z, Wang X, Cade R, Elmir Z, Fregly M, (2003). Peptides. 24(6), 937-43.
Does milk increase mucus production? Bartley J & McGlashan S.R, (2010). Med Hypotheses. 74(4):732-4.
Dipeptidyl-peptidase IV from bench to bedside: an update on structural properties, functions, and clinical aspects of the enzyme DPP IV Lambeir A.M, Durinx C, Scharpe S, De Meester I, (2003). Crit Rev Clin Lab Sci. 40(3):209-94.
Dipeptidyl-peptidase IV (CD26)–role in the inactivation of regulatory peptides Mentlein R, (1999). Regul Pept. 85(1):9-24.
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