Robinsons juucie cause excema?

[Dunnyjo]

Ds has suffered with excema for about a year now leaving him with cracked soar skin on his elbows and arms/legs back of knees.
However since i have stopped giving him robinsons sugar free juice and use only fresh juice with water it has completley cleared up. I know the juice was not gd for him and thats why i changd it but i would love to know what it was thats in it that caused it? Would anyone have any exp of this?

[Twiglett]

Think you've answered your own question really ...

the only way to prove it to yourself is to reintroduce

(would say that excema on back of arms and legs CAN be the result of clothing .. ie washing powder .. but I don't think that's the case here)