Don’t take our word for it. Here’s every fact on this site, with its evidence grade, its caveats, and a link to the source, so you can check us.
We start you on the strong ones: findings that have been replicated or come from one large, well-controlled study. Moderate and weak facts are here too, labeled for what they are. Use “Link to this fact” to share a single card.
Green, natural and unscented / Measured in people or real products
'Natural' oils get no special protection from air: in lab tests, lavender oil's main scent chemicals oxidized just as fast as a synthetic copy made only of those chemicals, and formed the same allergenic hydroperoxides.
Strong evidence: Lab chemistry, neat oil in open flasks over 10-45 weeks; one oil type (lavender), two batches.
Source: Hagvall 2008, Contact Dermatitis Industry-funded Link to this fact
Green, natural and unscented / Other evidence
Seal of Acceptance products must also exclude a named 34-ingredient Ecz-clusion List (including cinnamic alcohol, cinnamic aldehyde, coumarin, eugenol, farnesol, geraniol, hydroxycitronellal, isoeugenol, oak moss absolute, and several citrus extracts), chemical UV absorbers other than titanium/zinc/iron physical sunscreens, and formaldehyde releasers, in any amount.
Strong evidence: Ingredient-list exclusion, verified by NEA's own review, not independent chemical assay of finished products.
Source: NEA 2026 Link to this fact
Green, natural and unscented / Other evidence
OEKO-TEX Standard 100's limit table has no limit and no list for fragrance chemicals or fragrance allergens; the only fragrance-related rule is an odor test that requires 'no odor from mold, high boiling fraction of petrol, fish, aromatic hydrocarbons, or perfume'.
Strong evidence: Edition 02.2025 table only; the 2026 change notice mentions no fragrance row but the full 2026 table was not captured; odor test is a sensory judgment with no stated scale.
Source: OEKO-TEX Service GmbH, Standard 100 limit values Annexes 4-5, Ed. 02.2025 Industry-funded Link to this fact
Information, not medical advice. See also: myths we won’t tell you.