Unlike traditional protein supplements, in particular dairy derived such as whey, Pea Protein is entirely free of Lactose. However, it's not just lactose that often causes gut issues with protein supplementation.
Unlike eggs and dairy, the allergen spectrum ranks pea protein low as pea allergies are rare.
Pea protein is also gluten free which is another gut complaint that can hinder protein supplementation from more traditional sources
Pea protein is consider hypoallergenic making it great for suffers with other digestive issues such as IBS.