Sure, here are some more slogan suggestions that focus on the no additional ingredients aspect:

"Protein, pure and simple"
"Nature's power, no fillers"
"100% organic, 100% results"
"The cleaner choice for a healthier you"
"Real ingredients for real strength"
"Pure nutrition, no shortcuts"
"Vegan strength, nature's way"
"Stronger, cleaner, vegan"
"Unadulterated plant power"
"The natural way to fuel your body"
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