Clean Mass Gainer
Why we made this
Most mass gainers are 80% maltodextrin (a heavily processed corn starch) and cheap protein. Ours uses whole-food carb sources — expensive to formulate but you'll actually digest it well.
1 scoop with 12 oz whole or oat milk, 1–2 times daily between meals.
Underweight adults, endurance athletes in high training volume, teens (with parental guidance).
What's inside
Grass-fed whey protein isolate, oat flour, sweet potato flour, MCT powder, almond butter powder, natural vanilla, monk fruit.
Where it comes from
Wisconsin dairies; oats from Saskatchewan; sweet potato from North Carolina cooperative.
Stack it with
4.8 out of 5 · 8 verified reviews
Third-party COA on the website sold me. Clean Mass Gainer has become part of my morning stack — no chalky aftertaste and no bloat.
I train five days a week and recovery has been sharper. Ingredient list reads like a dietitian wrote it, which is basically the case.
Flavor is subtle in the best way. I'd love a family-size option of Clean Mass Gainer.
Tried AG1 and Ritual before this. Rivergrove wins on transparency and taste. Subscribe-and-save makes it a no-brainer.
She specifically flagged the sourcing standards. I've been on it three months and my labs improved at my last check-in.
Mixes clean in water, no gritty settle. Packaging is a little bulky but I'll take it for the quality.
I'm picky about what goes in my body during pregnancy planning. Rivergrove passed my OB's review.
You get what you pay for. Clean Mass Gainer is not the cheapest option but the quality is obvious after two weeks.
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