How to Audit Your Beauty Stash: Identifying Expired Skincare and Makeup

According to the Mamamia podcast episode "Spring Clean Your Beauty Cabinet: What To Keep, Swap, & Bin," hosts Leigh and Kelly ran a spring Q&A on auditing makeup, skincare, hair, and SPF stashes, including a segment on decoding expiry symbols. From a formulation standpoint, the audit reduces to three measurable checks: period-after-opening timelines, oxidative degradation markers, and phase separation. Everything else is preference.

The Three Non-Negotiable Checks

PAO markings (the open-jar icon with a number of months) only hold if the formula hasn't been compromised by handling. Anhydrous formats — balms, single-phase oils, wax-based sticks — resist microbial growth but oxidize. Polyunsaturated oils, including rosehip, evening primrose, and linseed-derived carriers, show oxidation through increased viscosity, darker color, and a shift toward a rancid odor. Water-based emulsions are more vulnerable to microbial ingress once the preservative system is depleted; visible mold, layering, or graininess disqualifies a product regardless of what the symbol suggests.

Beyond the icon, three physical assessments cover most audit cases:

• Phase separation. When an emulsion splits into a watery layer and a denser phase, the emulsifier system has degraded. Shaking does not restore the original droplet-size distribution; performance parameters are already altered.
• Color shift. Ascorbic acid serums turning amber to brown indicate dehydroascorbic acid formation, and efficacy drops in parallel with the color change. Retinol and several botanical extracts behave similarly.
• Texture anomalies. Crystallization in a previously smooth product, sudden graininess, or unexpected tackiness in a previously lightweight serum signal molecular breakdown.

SPF as a Special Case

Sunscreen warrants its own pass. UV filters degrade with both time and cumulative UV exposure. Organic filters — avobenzone, octinoxate, octocrylene — oxidize faster than mineral filters. An open bottle that has already been through a warm season is not the same formulation as when it left the factory, regardless of the printed date.

Context for the Rotation

E! News reports maximalist makeup as the trajectory replacing the "clean girl" aesthetic for 2027, anchored by New York Fashion Week's Spring 2027 runways: bold cobalt, plum, and black eyeliner at Marc Jacobs, colored brow gels from Pat McGrath, iridescent finishes from r.e.m. Beauty. Mamamia separately notes Marc Jacobs Beauty's return to Sephora. For a clean-leaning cabinet, the implication is operational — keep what matches the routine you will actually wear over the next twelve months. A rotation built around sheer, skin-tinted minimalism may need supplementation if saturated color and texture-driven finishes move into the default. The chemistry of the products doesn't shift with the trend, but the relevance of the audit does.