Concentration Limits4 min read
Salicylic Acid in a Shampoo Versus a Leave-On Serum
Why the same salicylic acid percentage can be fine in a scalp shampoo but risky in a leave-on face serum, and what that means for your filing.
June 30, 2026Read
Tagged leave-on
Concentration Limits4 min read
The Leave-On Versus Rinse-Off Allergen Threshold Gap
Why fragrance allergen disclosure kicks in at a different concentration for leave-on products than for rinse-off ones.
April 19, 2026Read
Concentration Limits3 min read
Fragrance Allergen List 1 and the Percentages That Trigger It
The actual math behind List 1 fragrance allergen disclosure, with worked examples for leave-on and rinse-off products.
April 14, 2026Read
Concentration Limits4 min read
How Concentration Sets Your Fragrance Allergen Triggers
The leave-on and rinse-off fragrance allergen thresholds in Canada hinge entirely on finished-product concentration math, not just ingredient presence.
April 11, 2026Read
Fragrance Allergens4 min read
Leave-On vs Rinse-Off: Which Allergen Threshold Applies
Why the same fragrance dose can trip Canada's allergen disclosure threshold in a lotion but stay under it in a shampoo.
March 27, 2026Read
Product Categories3 min read
Notifying a Beard Oil and Other Men's Grooming Products
How beard oils, balms, and men's grooming leave-ons get function-coded and declared on Canada's CNF like any other facial product.
March 14, 2026Read
Concentration Limits4 min read
Essential Oil Safe Usage Levels by Product Type
How leave-on and rinse-off products change what a safe essential oil percentage looks like, with the allergen math makers actually need.
February 14, 2026Read
Concentration Limits4 min read
Salicylic Acid Limits for Leave-On and Rinse-Off Products
Why salicylic acid's permitted level changes depending on whether your product stays on the skin or gets rinsed off, and what to check before filing.
February 12, 2026Read
Fragrance Allergens4 min read
Is Bar Soap Leave-On or Rinse-Off for Allergens
Why bar soap is classified rinse-off for allergen thresholds, and where lotion bars and cleansing balms complicate the answer.
January 9, 2026Read