How to Store Supplements Safely: Heat, Humidity, Expiry and Children
Knowing how to store supplements protects two things: the product and the people in your home. Heat and moisture can weaken vitamins and herbs before their date. Poor storage also puts children at risk, because many supplements look and taste like candy.
This guide covers where to keep supplements and which places to avoid. It also explains expiry dates, how to spot a product that has gone bad and how to dispose of old bottles. It uses guidance from MedlinePlus, the FDA and the CDC. For buying advice, see our guide to choosing a supplement.
Why storage matters for supplements
MedlinePlus, the NIH’s consumer health site, names four things that damage medicines: heat, air, light and moisture. It notes that pills and capsules are especially sensitive. The same applies to vitamin and herbal products, which come in the same forms.
Damage doesn’t always show. A tablet can look normal but contain less of an ingredient than the label states. Good storage is the simplest way to keep a product closer to what you paid for.
Where to store supplements, and where not to
- A high kitchen cabinet away from the stove, sink and appliances
- A dresser drawer or closet shelf
- A cabinet with a child latch or lock
- The fridge, only if the label says to refrigerate
- The bathroom, where showers create heat and moisture
- The car, including the glove compartment
- A sunny windowsill
- Above the stove or next to the dishwasher
- Kitchen counters and nightstands children can reach
The bathroom medicine cabinet is the most common mistake. MedlinePlus says heat and moisture from the shower, bath and sink can weaken medicines or make them spoil before their expiration date. A car is just as risky, with big swings in temperature and humidity.
How to store supplements in their containers
- Keep the original bottle. MedlinePlus advises keeping medicines in their original container. The label holds the lot number, ingredients, warnings and company contact.
- Remove the cotton ball. MedlinePlus notes that cotton can draw moisture into the bottle.
- Leave moisture packets in. The small desiccant packet is there to absorb humidity. Don’t swallow it.
- Close the lid tightly right after each use, and relock child-resistant caps until they click.
- Follow special label instructions, such as “refrigerate after opening” on some probiotics and oils.
- Be careful with weekly pill organizers. They expose pills to air and are easy for children to open. Keep them stored up and away too.
Supplements and children: the biggest storage risk
The CDC states that unintentional medication overdoses are the leading cause of emergency department visits in young children. Its Up and Away campaign specifically includes vitamins and supplements, naming gummies directly.
- Iron: the FDA requires a boxed warning on iron tablets and capsules. It reads: “Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children under 6.”
- Melatonin: a CDC report counted 260,435 melatonin ingestions by children from 2012 to 2021. Yearly reports rose 530%, and 83.8% involved children under 5.
Child-resistant caps help, but the CDC notes that children can sometimes open them. Storage location is the real protection.
CDC Up and Away tips
- Put supplements up and away and out of sight every time, including gummies. Don’t leave them on a counter or bedside table, even for a moment.
- Relock the safety cap by twisting until it clicks.
- Ask visitors to keep purses, coats and bags that contain medicines or supplements up and away.
- Save Poison Help, 1-800-222-1222, in your home and cell phones.
Also avoid calling gummies or chewables “candy” in front of children. And take your own supplements where children can’t watch and copy you.
Expiration dates on supplements
Many people are surprised to learn that supplements don’t need an expiration date. FDA labeling guidance says one is not required. If a company adds a date, it must have valid data showing the date is not false or misleading.
That means a missing date doesn’t tell you the product lasts forever. It only means the company chose not to state one. Write the date you opened a bottle on the label, so you can see how long it has been in use.
| Label wording | What to do |
|---|---|
| “Exp” or “Best by” with a date | Use before that date and dispose of it after |
| “Use within X months of opening” | Write the opening date on the bottle |
| No date at all | Write your purchase and opening dates, and check the product’s condition regularly |
Signs a supplement has gone bad
MedlinePlus advises not using medicine that has changed, even if it hasn’t expired. The same checks apply to supplements:
- A change in color, texture or smell
- Pills that are stuck together
- Tablets that are unusually hard or soft, cracked or chipped
- Gummies that have melted, fused or become sticky
- Softgels that leak or smell strongly rancid
- Powders that have clumped hard from moisture
When in doubt, throw it out. A replacement costs less than an unknown product.
Traveling with supplements
MedlinePlus advises packing medicines in your carry-on bag, in their original bottles. That keeps them out of hot or freezing cargo holds and makes them easy to identify. The same habit works for supplements, especially if you travel with more than one product.
In hotels and rental homes, the bathroom and the car are again the worst places to leave products. Keep them in a drawer or your bag, out of children’s reach.
How to dispose of old supplements
The FDA’s disposal guidance for unused medicines is a sensible model for supplements too. Take-back options come first.
- Use a take-back option if one is available, such as a pharmacy drop-off kiosk or a community take-back day.
- Otherwise, use the household trash: mix the product with something unappealing, such as used coffee grounds, dirt or cat litter.
- Seal the mixture in a bag or container that won’t leak.
- Scratch out personal information on the empty bottle before throwing it away.
Don’t flush supplements. The FDA advises flushing only the specific medicines on its flush list.
Common storage mistakes
- Keeping vitamins in the bathroom cabinet
- Leaving a bottle in the car or a hot bag
- Keeping gummies on the counter “as a reminder”
- Moving pills into unlabeled jars or bags
- Leaving the cotton ball in the bottle
- Assuming no expiry date means no expiry
- Flushing old products down the toilet
How to store supplements: FAQ
Should I keep vitamins in the fridge?
Only if the label says so. For most products, a cool, dry cabinet is better. Moving bottles in and out of the fridge can add moisture.
Why shouldn’t I store supplements in the bathroom?
Heat and moisture from showers and sinks can weaken products or make them spoil early, according to MedlinePlus.
Do supplements expire?
They can lose strength over time. The FDA doesn’t require an expiry date, but if one is printed, use the product before that date.
Is it safe to take expired vitamins?
An expired product may contain less of its ingredients than stated, and changes in look or smell are a warning sign. Dispose of expired products and ask a pharmacist if you’re unsure.
What should I do if my child swallows a supplement?
Call Poison Control at 1-800-222-1222 (US) right away, even if your child seems fine. Call 911 if the child has trouble breathing, collapses or has a seizure.
Do a five-minute storage check tonight
Gather every supplement in your home. Move anything in the bathroom, car or on a counter to a high, dry cabinet. Remove cotton balls, check dates and condition, and set aside anything expired for disposal. Then save Poison Control in your phone. For more safety basics, see our supplement guide.
Keep a record of every product and when you started it, plus emergency and Poison Control contacts on the same page.
This article summarizes published research and official guidance for educational purposes. It is not a recommendation to take any supplement and not an instruction to treat any condition. Supplements can cause side effects and interact with medicines. Please talk to a doctor or pharmacist before starting one, and never delay or stop medical treatment because of anything you read here.
Sources
- MedlinePlus (NIH National Library of Medicine). Storing your medicines. medlineplus.gov
- U.S. Food and Drug Administration. Where and How to Dispose of Unused Medicines. fda.gov
- U.S. Food and Drug Administration. Dietary Supplement Labeling Guide, Chapter I (expiration dating). fda.gov
- U.S. Food and Drug Administration. Dietary Supplement Labeling Guide, Chapter VIII (iron warning statement). fda.gov
- Centers for Disease Control and Prevention. Up and Away Campaign. cdc.gov
- Lelak K, Vohra V, Neuman MI, et al. Pediatric Melatonin Ingestions — United States, 2012–2021. MMWR. 2022;71(22):725–729. cdc.gov
- Poison Control (US). poison.org
Last reviewed: October 2026