Health, fitness and the supplement aisle.
Safety and regulation · Answer
Most dry supplements past their date are not dangerous but lose potency, and the risk rises if they were stored badly. Discard anything that smells rancid, looks damp, clumps or shows mould. Fish oil, probiotics and vitamin C degrade fastest, while creatine monohydrate is very stable. In South African summer heat, storage matters as much as the printed date.
South African labelling law (R146) requires date marking and a batch number. A "best before" date is the manufacturer's estimate of how long the product keeps its stated quality when stored as directed. It is not a cliff edge, but it is the date up to which the label claims hold.
For most products, a few months past the date means reduced potency rather than toxicity. The real hazards come from spoilage:
| Supplement | What happens | Practical advice |
|---|---|---|
| Fish oil / omega-3 | Oxidises and turns rancid (fishy smell, bitter taste) | Discard if it smells or tastes off; oxidation is the main quality issue |
| Probiotics | Viability falls with heat and time | Follow storage instructions; many people refrigerate in summer |
| Vitamin C, B vitamins | Gradual loss of potency | Replace after the date |
| Whey and plant proteins | Clump, absorb odours, fats can oxidise | Keep sealed and dry; discard if smelly or damp |
| Creatine monohydrate | Very stable as a dry powder | Fine at room temperature while dry; discard if wet or clumped hard |
| Pre-workout | Flavour and sweetener fade; caffeine remains | Check for clumping and odour |
| Effervescent tablets | Humidity ruins them | Keep the lid closed tightly |
Yes. A date assumes a cool, dry cupboard. Tubs left in a hot car boot, a sunny window sill or a humid Durban bathroom can degrade well before the date. Storage tips are in how to store supplements in South African summer heat, with specifics for whey and creatine. Refrigeration is not needed for most powders, and condensation from fridge use can harm them.
Category D products carry a SAHPRA disclaimer, but expiry rules are the same. If a supplement supports a medical need (iron for diagnosed deficiency, vitamin D for deficiency), replace it on time rather than relying on diluted potency. Athletes under drug testing should not use old, opened or poorly stored products, because contamination risk and quality are harder to guarantee.
Buy sizes you will finish within a few months, especially for omega-3 and probiotics. Large tubs of creatine and whey are fine at a steady rate of use. Compare cost per dose before choosing a bigger size: see how to compare supplement prices.
Educational information, not medical advice. Speak to a doctor, pharmacist or registered dietitian before using supplements if you are pregnant or breastfeeding, under 18, taking medication, or living with kidney, liver or heart disease. Prices were observed in October 2026 and are not offers.