Butter alternatives (allergen friendly)

Yes. Earth Balance is the best alternative butter I have found. My son is allergic to the protein in cow's milk (actual allergy-not lactose intolerant.) I use this in baking and cooking and NOBODY has been able to taste the difference between EB vs. unsalted 'real' butter in anything I have made.

You can usually use salted butter in place of unsalted butter and reduce or omit the salt in the recipe—it may not be exactly as intended, but it’ll work. (BTW, I’ve heard Earth Balance is a good brand in general). Two articles that may help you out: Here’s one on butter alternatives: https://food52.com/blog/25598-best-butter-substitutes and here’s one on swapping salted for unsalted: https://food52.com/blog/15584-can-you-swap-salted-and-unsalted-butter-in-baking