Is it safe to take plant protein every day?

For most healthy adults, yes, based on the closest available research: daily higher-protein intake didn't worsen kidney function in people with normal kidneys, and modeled heavy-metal exposure from protein-powder surveys stayed below health-risk thresholds even at three servings a day. None of that research tested our specific fava bean and yeast blend, and none of it covers pregnancy, childhood or existing kidney disease.

Everyday exposure: what the heavy-metal modeling found at daily doses

A risk-assessment analysis pooled heavy-metal concentrations (arsenic, cadmium, mercury, lead) reported in two independent surveys of protein powder supplements and modeled a cumulative hazard index for one serving a day and for three servings a day. Every modeled exposure stayed below a hazard index of 1 (the threshold below which no increased health risk is expected), and modeled blood-lead levels stayed under the CDC's guidance value, at both daily-use levels. Whey scored lowest for heavy-metal risk among the categories in that analysis; it didn't include our specific blend.

A separate 2026 study tested 30 commercial sports protein supplements (purchased in China) for heavy metals and microplastics. Plant-derived products averaged significantly higher lead and cadmium than dairy-derived products, and microplastics turned up in every sample. Even so, deterministic modeling put the hazard index at 0.45 for a 30 g/day serving and 0.90 for 90 g/day — both under the level of health concern — though a high-use, 95th-percentile scenario reached 1.28. This study didn't test our tub; it's category-level evidence about plant-derived protein supplements generally, and it's the reason we hold no third-party heavy-metal test result of our own to point you to (see third-party testing for plant protein).

Daily protein intake and kidney function over time

A 2018 systematic review and meta-analysis of 28 randomized controlled trials (1,358 participants) compared higher-protein diets (≥1.5 g/kg/day or more) against lower-protein diets for their effect on kidney function (GFR). The change in GFR over the trial period didn't differ between the higher- and lower-protein groups, in people who had normal kidney function at the start. That's daily, sustained intake, not a single dose — and it doesn't extend to anyone who already has kidney disease.

A 10-year longitudinal cohort study of 1,374 older women (mean age 75) measured habitual dietary protein intake against kidney function at baseline, 5 years and 10 years. Higher plant-protein intake was associated with a slower decline in estimated kidney function over that decade; animal-protein intake showed no association either way. That's food-based, habitual intake measured by questionnaire — not a trial of a protein-isolate powder — but it's directly about long-term, everyday use rather than a one-time dose.

What this doesn't cover

None of the research above tested this specific fava bean and yeast protein blend for daily use. None of it enrolled pregnant or nursing people, or children and teenagers — our label directs those groups to talk to a doctor first, not because a study found a problem, but because none was done. And none of it applies to anyone who already has kidney disease, where daily protein intake works differently; see who should not take plant protein.

Questions people ask

Is plant protein safe?

For most healthy adults, the closest daily-use research — on kidney function and on modeled heavy-metal exposure — doesn't point to a safety problem. It wasn't conducted on our specific blend, and it doesn't cover pregnancy, childhood or existing kidney disease.

Is it OK to drink plant protein every day?

The research above modeled daily and even three-times-daily servings for heavy-metal exposure and found it stayed under health-risk thresholds. Our label directs one two-scoop serving daily; we have no data on higher daily amounts for this blend.

Are plant protein powders safe from lead?

Testing across the category found plant-derived protein supplements averaged higher lead than dairy-derived ones, though modeled exposure at typical servings stayed below health-risk levels for nearly every product tested. We hold no independent heavy-metal test result for our own tub.

Is daily plant protein bad for your kidneys?

Not based on trial evidence in people with normal kidney function — see the meta-analysis above. Existing kidney disease is a different situation and a reason to talk to a doctor before adding daily protein of any kind.

Related reading: how much plant protein should you take a day, third-party testing for plant protein: what the seals mean, and who should not take plant protein.