Unfortunately, the original version of this article [1] contained an error. Figure 1 has been updated since it was last uploaded. BCM-7, GSH and MPO have all been removed and PD3 is replaced by VAS. The figure is included here. The figure legend has also been changed. It used to read as:

Fig. 1
figure 1

Study design. A1 = milk containing A1 and A2 β-casein; A2 = milk containing only A2 β-casein; hs-CRP, highly sensitive C-reactive protein; Hb, hemoglobin; IL-4, interleukin-4; Ig, immunoglobulin; VAS, visual analog scale scores; SCIT, Subtle Cognitive Impairment Test; SCFA, short-chain fatty acids

Study design. A1 = milk containing A1 and A2 β-casein; A2 = milk containing only A2 β-casein; hs-CRP, highly sensitive C-reactive protein; Hb, hemoglobin; IL-4, interleukin-4; Ig, immunoglobulin; BCM-7, β-casomorphin-7; GSH, glutathione; PD3, gastrointestinal symptoms of post-dairy digestive discomfort; SCIT, Subtle Cognitive Impairment Test; SCFA, short-chain fatty acids; MPO, myeloperoxidase.

It has now been changed to read as follows:

Study design. A1 = milk containing A1 and A2 β-casein; A2 = milk containing only A2 β-casein; hs-CRP, highly sensitive C-reactive protein; Hb, hemoglobin; IL-4, interleukin-4; Ig, immunoglobulin; VAS, visual analog scale scores; SCIT, Subtle Cognitive Impairment Test; SCFA, short-chain fatty acids.

There will be an update for these corrections as well as this erratum.