Media Release coverage of the Spuds2Suds project in April 2025 led by Maggie McNeil and Samuel Harding included statements regarding the properties and benefits of potato-based soap:
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Potato starch described as “rich in vitamins and minerals.”
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Claims that the soap promotes “collagen production.”
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Described as “organic” because potatoes are grown in the ground.
Such representations do not appear to be supported by established cosmetic science literature. Under Canadian regulatory standards governing cosmetics, product representations must not be false, misleading, or unsubstantiated. In the absence of credible scientific evidence to support these claims, such representations may be inconsistent with accepted cosmetic advertising and labeling principles and could mislead consumers regarding the composition, function, or benefits of potato-based soap.
From a cosmetic science perspective:
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Rinse-off soap limitations – Traditional soap is applied briefly and rinsed off, making delivery of biologically active compounds to the skin minimal.
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Potato starch composition – Potato starch is primarily carbohydrate (amylose and amylopectin) and is not a meaningful source of bioavailable vitamins in soap.
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Vitamin instability – Many vitamins degrade in alkaline soap (pH ~9–10) during saponification, reducing potential efficacy.
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Collagen production claims – Topical claims of stimulating collagen require controlled scientific studies demonstrating dermal penetration and measurable biological effects. A starch-containing rinse-off soap would be unlikely to meet this standard.
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“Organic” designation – Regulatory standards require certified organic production. Simply growing potatoes in soil does not justify the claim in a cosmetic context.
Summary Statement:
Based on established cosmetic science principles, a rinse-off potato-based soap would not reasonably be expected to deliver bioavailable vitamins, promote collagen production, or meet regulatory definitions of “organic.”
