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 rinse-off
Fragrance Allergens4 min read
Which Allergens Show Up on a Shampoo Label
A worked shampoo example showing how the rinse-off allergen threshold drops several fragrance allergens off the label compared to leave-on products.
June 23, 2026Read
Soap & Handmade4 min read
Are Micas Safe and Legal Colorants for Your Soap
Cosmetic-grade mica needs the right INCI name and supplier documentation, and rinse-off soap changes the allergen math versus leave-on color cosmetics.
June 18, 2026Read
Soap & Handmade4 min read
Essential Oil Limits That Apply to Scented Soap
A handful of popular soap-scenting essential oils carry hotlist restrictions or allergen loads worth checking before your next batch.
June 17, 2026Read
Fragrance Allergens3 min read
The 0.01 Percent Rinse-Off Allergen Trigger Explained
Why rinse-off products get a threshold ten times higher than leave-on ones for fragrance allergen disclosure, and what that means for shampoo and cleanser formulas.
May 22, 2026Read
Soap & Handmade4 min read
The Rinse-Off Allergen Threshold That Governs Soap
Why soap gets a higher fragrance allergen disclosure threshold than lotion, and how that 0.01% rinse-off line actually plays out in a real formula.
May 6, 2026Read
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
Product Categories3 min read
Clay and Mud Mask Notifications Without Detox Overreach
How to file a clay or mud mask on Health Canada's CNF and which purifying claims stay cosmetic instead of drifting into drug territory.
April 6, 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
Ingredient Guides4 min read
Sodium Lauryl Sulfate (SLS) for Soap and Cleanser Makers
A working profile of sodium lauryl sulfate as a primary surfactant, its INCI and CAS numbers, and how to declare it in a rinse-off filing.
March 24, 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
Methylisothiazolinone Rinse-Off Limits You Should Know
MIT's rinse-off restriction is tighter than most preservatives, and leave-on use is effectively unworkable. Here is what soap and wash makers need to check.
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
Declaring Fragrance Allergens on Cold Process Soap
How rinse-off status and real fragrance load change your allergen math and label for cold process soap under Canada's new rules.
January 11, 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