Not Just a Label: How Yein&Young Earned Its Hypoallergenic Certification
Not Just Gentle by Nature — Clinically Proven for Sensitive Skin
In the world of skincare, “hypoallergenic” is one of the most sought-after claims—and one of the most misunderstood.
To some, it simply means “gentle.” To others, it’s a promise of safety. But not every product that claims to be hypoallergenic is actually backed by science. Yein&Young is.
And for those with sensitive skin, recovering bodies, or conscious lifestyles, that distinction matters deeply.
What Does Hypoallergenic Actually Mean?
A product that is hypoallergenic is formulated to minimize the risk of allergic reactions. But unlike organic or halal labels, "hypoallergenic" isn’t universally regulated—which means many brands can use the term without thorough testing.
Yein&Young takes a different path. Rather than relying on marketing language, the brand conducted an official 21-day Repeat Insult Patch Test (RIPT)—a rigorous clinical trial that challenges how the skin reacts over time.
Inside the Clinical Study: How Yein&Young Was Tested
The evaluation was conducted in June 2021 by the Skin Tree Center, led by dermatologist Dr. Gertrude P. Chan, M.D., M.Sc., and aligned with international standards like the Declaration of Helsinki and COLIPA Guidelines for cosmetic testing.
The study involved 35 human volunteers with clinically confirmed sensitive skin. Over a 21-day period, Yein&Young products were repeatedly applied to the skin under controlled conditions to:
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Assess primary irritation potential
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Observe sensitization reactions
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Compare results with known irritants such as sodium lauryl sulfate or parfum
The Results: Low Irritation, Low Sensitization
Here’s what the science found:
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Primary Irritation Index (PII):
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Conclusion: For Yein&Young soap and shampoo it is significantly less irritating than common surfactants
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Sensitization Testing (Challenge Tests):
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After three separate challenges, Yein&Young scored 14% or lower in 2 of 3 tests—a benchmark indicating a low risk of allergic response (castile soap)
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Final conclusion: Low probability to cause allergic reactions, even in sensitive individuals
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✔ Certified: Safe for Sensitive Skin
✔ Tested: Not just rinse-off, but under 48-hour occlusion
✔ Clinically Verified: Not a claim, but a proven result
Why This Matters to Real People
For those with reactive skin, the difference between “natural” and “hypoallergenic” can mean the difference between calmness and a flare-up.
For cancer patients, postpartum mothers, eczema sufferers, or even just someone who’s been burned by “clean” beauty before, proof matters.
Knowing that Yein&Young has passed clinical trials with sensitive skin users means fewer worries. It means more trust. It means skin that isn’t just cared for—it’s respected.
More Than a Claim. A Commitment.
Yein&Young doesn’t just aim to be "natural." It strives to be safe, proven, and transparent. The hypoallergenic claim isn’t decoration—it’s an assurance, backed by science, tested on sensitive skin, and led by clinical professionals.
For every parent, every health-conscious consumer, every person choosing products with care—this is the peace of mind they’ve been waiting for.
