Private Label Skincare Shelf Life & Expiry Dating FAQ
What is the difference between shelf life and period after opening (PAO)?
Shelf life is how long the unopened product stays within specification from manufacture, set by real-time and accelerated stability studies. PAO is how long the product remains safe and effective after first opening, once air, moisture, and microbes have entered. In the EU, products durable beyond 30 months must show a PAO symbol; products durable 30 months or less must show a best-before date.
Source: European Commission — EU Cosmetics Regulation 1223/2009, Article 19 (2024).
Does the FDA require expiration dates on cosmetics?
No. U.S. cosmetics are not required to carry an expiration date, and FDA does not pre-approve cosmetics before sale. If a brand chooses to print a date, the date and any related claims must be truthful and backed by stability data, because the brand — not the manufacturer — is responsible for what the label states.
Source: U.S. FDA — Cosmetics Stability, Expiration Dating & Labeling Guidance (2024).
How is a skincare shelf life determined?
Shelf life is set by the parameter that fails first in a stability program: real-time storage at 25°C/60% RH tested at set intervals, accelerated studies at 40°C/75% RH, freeze-thaw cycles, and preservative efficacy testing. Common private-label skincare shelf lives run 24 to 36 months, with shorter lives for enzyme- or active-sensitive formulas.
Source: ISO — Cosmetic Stability & Quality Standards (2024); U.S. FDA — Cosmetics Stability Guidance (2024).
What does the EU require for dating on cosmetic labels?
Products with a minimum durability of 30 months or less must carry a best-before date, typically written "Best before end: MM/YYYY." Products durable beyond 30 months must instead carry the period-after-opening symbol — an open jar pictogram with a number such as 6M or 12M. Both are set from stability evidence, not from competitor labels.
Source: European Commission — EU Cosmetics Regulation 1223/2009, Article 19 (2024).
Why do similar products have different PAO periods?
PAO reflects real contamination risk after opening, which varies by packaging and formula. A jar opened by fingers carries more microbial risk than an airless pump; a high-water gel with a light preservative system shortens the window versus a low-water oil formula. Preservative efficacy challenge testing at the end of the claimed opened period is the evidence behind each PAO number.
Source: U.S. FDA — Cosmetics Stability Guidance (2024); ISO — Cosmetic Stability & Quality Standards (2024).
How should a brand handle dating for multi-market export?
Dating is destination law: the EU requires best-before or PAO formats, the U.S. treats expiration dating as optional but substantiated, and ASEAN member states follow the Cosmetic Directive labeling annex with notification per country. Plan artwork per destination at the label stage — a single run serving several markets often needs dual-format labels or separate files reviewed before printing.
Source: European Commission — EU Cosmetics Regulation 1223/2009 (2024); ASEAN — ASEAN Cosmetic Directive Labeling Annex (2025).