Who should not take plant protein?

Most healthy adults can take a plant protein powder without issue. The people who should talk to a doctor first are anyone with existing kidney disease, anyone pregnant or nursing, children under 18, and anyone with a known medical condition or a relevant food allergy — all called out on our label.

Reduced kidney function

A 2018 systematic review and meta-analysis of 28 randomized trials (1,358 people) found that higher-protein diets did not worsen kidney function (measured by GFR) compared with lower-protein diets — but every participant in that analysis had normal kidney function to start. That finding doesn't extend to people who already have reduced kidney function, because that population wasn't studied there. Protein is cleared partly through the kidneys, and impaired clearance changes how a given intake behaves in the body, so ask your doctor before adding a plant protein supplement if you have kidney disease.

One thing specific to plant protein: a separate 10-year cohort study of 1,374 older women found that higher plant-protein intake — measured from food, mostly fruit, vegetables and nuts, not a protein-isolate powder — was associated with a slightly slower decline in estimated kidney function, while animal-protein intake showed no association either way. That's food-based observational data, not a trial of a protein powder, and it isn't a reason to switch products for kidney health — but it does mean the research doesn't point toward plant protein being worse for kidney health than animal protein.

Pregnancy, nursing and children

Our label calls out pregnant or nursing mothers and children under 18 as groups who should consult a physician before use, and we don't have research or label directions specific to those groups for this product — follow that instruction rather than the general adult information elsewhere on this page.

Known medical conditions and allergies

The label directs anyone with a known medical condition to consult a physician before use. One specific label gap worth knowing: MCT Oil Powder is in the ingredient list, and MCT oil is commonly derived from coconut, an FDA-classified tree nut. Our label doesn't state the source oil, so if you have a tree-nut allergy, that's worth confirming before you use this product — we can't confirm it for you from the panel alone.

Questions people ask

Is plant protein powder bad for kidneys?

Not based on the research in healthy adults — see the meta-analysis and cohort study above. Existing kidney disease is a different situation and a reason to talk to a doctor first.

Is plant protein better for kidneys than whey or other animal protein?

One 10-year cohort study found a small association between higher plant-protein intake and slower kidney-function decline, with no such link for animal protein — but that study measured food, not a protein powder, and shouldn't be read as a reason to switch products for kidney health.

Why is plant protein not good for some people?

For most healthy adults it's a reasonable protein source. It isn't automatically "not good" for anyone specifically — the exceptions are the caution groups above: existing kidney disease, pregnancy or nursing, being under 18, a diagnosed medical condition, or a relevant food allergy.

Related reading: plant protein side effects, plant protein and medications: what to check, and how much plant protein should you take a day.