Tartrazine is known as E102 over here and causes all kinds of issues.
It used to be used a lot in childrens drinks but was known to cause hyperactivity and mental stress, making it difficult for children to study.
I'm not sure the alternatives are any better but as natural as can possibly be would be the best colouring . Or none at all
Copied/pasted from here https://www.exploreenumbers.co.uk/Dangers-and-Side-Effects-of-E-Numbers.html
E102 - tartazine
This is also a yellow food colouring and may cause allergic reactions in some people, including asthma attacks. It’s found in a range of products, such as soups, custard powder, mustard, marmalade, jelly, marzipan, ice lollies, fizzy drinks and squash. Again, it’s recently been found to increase hyperactivity in children. The government now recommend that, if a child has signs of hyperactivity or ADHD, it’s worth avoiding this additive. It is already banned from use in Austria and Norway.