The key phrase for ukb readership is "Beta-alanine attenuates neuromuscular fatigue, particularly in older subjects..."
Agree that there is huge potential for bias and lots of small studies some with industry donations of product. Six studies with negative results were included in the metanalysis, which I think is pretty good for this sort of thing?? But yes the downside of metanalyses in general is magnification of lots of dodgey primary research.
That's exactly the point MofF.. We're talking about something that 'might' let you get 2 or 3 more moves up a rock climb before you feel too pumped. We're not talking about something that might cure a serious illness but alternatively might make you worse. I think some posters might be prone to either forgetting or ignoring context when they start analysing studies about training and supplements. Really, who else but vested interests are going to push for studies? This thing isn't essential or even important to mankind. Unless you're selling supplements.. or a very well funded national sporting body..