Singers drinks

Is it ok to drink protein shakes with soy milk as its not a dairy drink? Pretty much protein shakes with soy milk?

When it comes to singing that is

It should be! The only way to find out is to try it and see if it affects you, since we're all different. 

Please see this blog post for more: https://www.30daysinger.com/blog/food-drink-and-medication-what-impacts-your-singing-voice.