Hair Experts Explain: Do Shampoo and Conditioner Expire?

TL;DR:

• Yes — shampoo and conditioner expire. Most products have an open-jar symbol indicating months of optimal use after opening
• Replace every 12 to 18 months, even if there's no printed expiry date
• Signs of expiration: changed smell, separated or lumpy texture, reduced effectiveness, visible discolouration
• A bad smell is the clearest indicator — trust your nose
• Storing products in the shower exposes them to heat and humidity that accelerates degradation

Hair care products do expire — and using them past their effective life can mean you're working your way through an expensive shampoo that's no longer doing what it says on the bottle. Here's what our Cape Town stylists look for.

Meet the experts:
Royston and Warren at Cavendish Square — Judy, head trainer — Lewis, owner — Jackie at Gardens Centre — Debbie and Nikí at V&A Waterfront — Danny and Charlene at Canal Walk — Lynette, Samantha and Dominique at Constantia Village

01 — Yes, Hair Products Expire

Most hair care products are required to carry an open-jar symbol on the packaging — a small jar icon with a number inside it, like "12M" or "24M". This indicates how many months the product remains effective after opening. A shampoo you opened eighteen months ago but haven't used up is likely past its best, regardless of whether there's a printed expiry date.

"We check dates and product condition on the client's products when they come to us with concerns," says Judy, head trainer. "Shampoos and conditioners that have expired often look and smell slightly off — once you know what to look for, it's obvious. The sad thing is how many clients have been wondering why their routine isn't working, and the product is three years old."

02 — Signs That a Product Has Expired

Changed smell — the most reliable indicator. If a shampoo that should smell fresh and clean has developed a sour, rancid, or just "off" smell, it's gone. Changed consistency — lumpy, watery, or separated product has chemically changed and won't perform as formulated. Discolouration — a significant colour change in the product itself. Reduced effectiveness — if your shampoo is suddenly barely lathering or your conditioner isn't smoothing as it should, expiration is a possible cause. Visible mould or bacteria — discard immediately, no negotiation.

03 — Replace Every 12 to 18 Months

Even without an open-jar symbol, the general guideline from professional standards is to replace shampoo and conditioner every 12 to 18 months. Active ingredients in professional-grade products degrade over time — a caffeine-based scalp shampoo at month 20 is likely significantly less effective than at month two. The product may still lather, still rinse out, and still smell fine, but the actives it was formulated around may no longer be at meaningful concentrations.

04 — How Storage Affects Shelf Life

Storing products in the shower is one of the fastest ways to shorten their effective life. Heat and humidity accelerate the breakdown of active ingredients and preservative systems. Products stored in a cool, dry cabinet away from direct sunlight or shower steam last closer to their intended period. If a product regularly gets water inside the cap or spout, contamination starts earlier.

"In Cape Town's warm summers, products stored in the shower can degrade significantly faster than the open-jar guidance assumes," says Warren at Cavendish. "We always recommend storing professional products outside the shower if possible. The cool, dark cupboard under the basin is genuinely better for preserving their effectiveness."

05 — Invest in Products Worth Keeping Fresh

There's a secondary argument for buying quality products in smaller sizes rather than economy sizes: you're more likely to finish them within the optimal window. A 250ml Kérastase shampoo used three times a week gets finished in six to eight weeks. A 1 litre bargain shampoo used at the same frequency takes six months to a year — by which point the active ingredients have significantly degraded.

Kérastase Nutritive Bain Satin Riche is one of our most consistently recommended shampoos for very dry hair. A genuinely highly nutritive formula with anti-dryness polymers that replenish moisture and comfort. The 250ml size is the right size to get through within an optimal window.

06 — Professional Products at Partners Hair

All Kérastase and professional products stocked at Partners Hair are sourced from official South African distributors with correct storage and rotation. If you're unsure whether a product you've had for a while is still effective, bring it in — our team can assess it honestly.

Frequently Asked Questions

How do I know if my shampoo has expired?

Check the open-jar symbol on the packaging for the recommended months after opening. Trust your senses: changed smell, changed texture, or reduced effectiveness are all signs. If in doubt after 18 months, replace it.

Can expired shampoo damage hair?

Expired product won't typically cause dramatic damage, but it may not do what it claims — leaving you with a routine that isn't actually delivering results. In rare cases, expired preservative systems can harbour bacteria that cause scalp irritation.

What's the best way to store hair products?

Outside the shower, in a cool and dry location away from heat and direct sunlight. The basin cupboard is better than the shower shelf for extending the effective life of professional products.

How often should I replace shampoo and conditioner?

Every 12 to 18 months as a general guideline, or when the open-jar symbol period has elapsed. With professional-grade products used regularly, you'll typically finish well within this window anyway.

Where can I buy Kérastase Bain Satin Riche in South Africa?

Partners Hair stocks the full Kérastase range including Bain Satin Riche online and in our Cape Town salons. All products are authenticated and sourced directly from official distributors.

Shop professional Kérastase shampoos and conditioners at Partners Hair, or find your nearest Cape Town salon. Free delivery on orders over R390.