Why fragrances get reformulated
Learn why perfume formulas change, how IFRA standards differ from legal bans, and what labels, batch codes and scent comparisons can actually establish.
By Fragrance Fragrance EditorialPublished Updated
Fragrances are reformulated when a maker changes their composition while continuing the release under the same name. Reasons can include legal requirements, industry standards, ingredient supply and commercial or creative decisions. The reason for a particular change needs evidence from that fragrance’s maker.
A new bottle smelling different does not establish which of those causes applies. Aging, storage, material variation and the conditions of comparison can also affect what you notice. Reformulation can be subtle or substantial; it is not automatically a reduction in strength.
| Driver | What can change | What would establish the cause |
|---|---|---|
| Legal requirements | A material may become prohibited or subject to a legal limit in a market. | The applicable regulation and evidence that the formula required adjustment. |
| Industry standards | A maker following IFRA Standards may need to change material levels or specifications. | The relevant Standard, its scope and implementation dates. |
| Material supply | An ingredient or grade may become unavailable, or sourcing may change. | A supplier or brand statement about the material used in that release. |
| Commercial or creative decisions | A maker may alter a composition, manufacturing arrangement or target scent. | A statement or documentation; ownership or packaging changes alone are insufficient. |
IFRA Standards and the law are different
IFRA Standards are an industry system for managing fragrance ingredient risks. They can prohibit a material, limit its use or set specifications. They do not replace the laws of the market where a fragrance is sold.
A concrete legal example is EU Regulation 2017/1410, which added HICC, atranol and chloroatranol to the cosmetics prohibited-substances list. Its transition dates were August 23, 2019 for placing affected cosmetics on the market and August 23, 2021 for making them available. Describing this simply as “IFRA banned oakmoss in 2017” confuses the authority, the substances and the dates.
Changing a material can require adjustments elsewhere in the formula to preserve its balance. The scale of that work depends on the composition. A restriction does not demonstrate that every fragrance containing a related note was changed in the same way.
How to investigate a suspected change
Start with the exact name and concentration on both bottles. An eau de toilette, an eau de parfum and a later flanker may be different compositions even when their packaging is similar.
Next, look for an explicit statement from the brand. Keep photographs of the packaging and any production codes when contacting customer service. A code can help identify a batch, but it is not a public formula record.
Ingredient labels can offer clues, though a changed allergen list may reflect updated disclosure requirements rather than a different scent formula. Conversely, two labels can look the same while the fragrance mixture differs. Note pyramids are even less useful for this purpose because they describe scent impressions.
What a comparison can tell you
Trying two bottles under similar conditions can help describe a difference you perceive. Use the same application surface and allow the same time after spraying. Record the bottle details rather than relying on memory of a release worn years ago.
The comparison still cannot establish why the difference exists. An old bottle is an aged reference, and its storage history may be unknown. Describe what you notice—such as a drier opening or less detectable base—without treating it as proof that a particular material was removed.
For a purchase, a sample from current stock is more useful than assuming that every bottle with an older code is better. The reformulation glossary entry distinguishes this from discontinuation and vintage labeling.