Health guide
Storing Supplements in Hot and Humid Climates
Heat and humidity are part of daily life in Mombasa or Lagos, and a few storage habits keep supplements at their best right up to the date on the pack.
What heat and humidity actually do
Heat speeds up chemical change, so active ingredients keep best in a cool place. Humidity causes powders to cake, tablets to soften and capsules to stick.
Light adds a third factor, particularly for oils and for light-sensitive vitamins such as riboflavin.
The products that need most care
Probiotics are sensitive to heat, which is why shelf-stable formulations, made to travel and keep without refrigeration, are the sensible choice in warm climates.
Fish and other oils oxidise over time, and a strong fishy smell shows a product past its best. Effervescent tablets absorb moisture and lose their fizz. Gummies soften and fuse.
Where to store them at home
The kitchen cupboard above the cooker and the bathroom cabinet are the two places to avoid in most homes, because both combine heat and humidity.
A cool interior cupboard away from external walls, windows and cooking heat is ideal. So is a sealed container with the original desiccant sachet left inside.
- Not the bathroom, not above the cooker, not on a windowsill
- Not in a car, where interior temperatures rise dramatically
- Original container, tightly closed, with the desiccant kept in
- Out of reach of children — particularly iron-containing products
Buying and delivery
Choose a pack size that matches your course, so each pack is finished comfortably within its date. Check the expiry date when the parcel arrives.
When the delivery comes, put the pack straight into a cool cupboard rather than leaving it in a hot vehicle or in the sun.
How to tell something has gone off
Trust your senses. A strong rancid or fishy smell from oil capsules, tablets that have changed colour or crumble, powder that has set solid, capsules stuck together, or any visible moisture inside the container all indicate a product to discard.
Discard rather than use, and start a fresh pack.
Frequently asked questions
Should I keep supplements in the fridge?
Only if the label says so. Fridges are humid, and repeated warming and cooling can be worse than a stable cool cupboard.
Is an expired supplement dangerous?
Usually it is simply less potent rather than harmful. Oxidised oils are the main exception and should be discarded.
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Medical disclaimer. BioMedic Africa publishes consumer health information and supplement research summaries. It is not a pharmacy, a clinic or a medicines regulator, and nothing here is a diagnosis, a prescription or a treatment plan. Dietary supplements are foods, not medicines: they are not intended to diagnose, treat, cure or prevent any disease. Speak with a pharmacist or a qualified healthcare professional before starting any supplement, especially if you are pregnant or breastfeeding, under 18, living with a long-term condition, or taking prescription medication.