Official U.S. shopStorage
How to Store C60 Olive Oil (and Why Light Matters)
Store C60 olive oil like Mighty K9 in a cool, dark cupboard with the cap closed, away from stoves, sunny windows and car dashboards. Light matters: in a 2021 mouse study, C60 oil left in light for 4 to 8 days killed 25 to 50% of the mice. The brand does not publish how long an opened bottle lasts.
Written by the Mighty K9 editorial teamUpdated · 8 min read
The research
Why does light matter for C60 olive oil?
Light can change C60 in oil into something harmful. In a 2021 study, C60 olive oil exposed to strong light for 4 to 8 days killed 25 to 50% of the mice that got it (Grohn et al., 2021).
The same researchers kept other C60 oil protected from light. Those mice did not die early, though they did not live longer either: median lifespan was 144 weeks with C60 and 145 without. The study also found commercial C60 oils ranged from 0.57 to 1.4 mg per mL, so products are not all alike.
Mice are not dogs, and the light in that study was not a kitchen cupboard. Still, the lesson is simple. Treat ESS60 oil like something that should stay in the dark.
On the label
How should you store Mighty K9, according to the label?
The product page says: "Store in a cool and dark place." It also says to keep it out of reach of children and animals. The bottle is amber glass, which filters much of the light that reaches it.
Amber glass is a good start, not a shield. Light still gets through over time, and heat passes through any glass. The cupboard is what really protects the oil.
| Spot | Verdict | Why |
|---|---|---|
| Closed kitchen cupboard, away from the oven | Good | Dark and cool |
| Pantry shelf or bedroom drawer | Good | Dark, steady temperature |
| Counter beside the dog bowl | Poor | Daylight and room lights all day |
| Windowsill | Avoid | Direct sun and heat |
| Shelf above the stove or toaster | Avoid | Repeated heat |
| Car dashboard or glove box | Avoid | A parked car heats up fast in sun |
Daily habits
What are the steps to store C60 oil safely every day?
Four small habits cover it. Do them each time you give the 2 mL serving.
- 01
Cap on right away
Draw the 2 mL, put the dropper straight back and screw the cap closed. Air and light both age oil.
- 02
Out of the light
Keep the bottle in a closed cupboard or drawer, not on a sunny counter or windowsill.
- 03
Away from heat
Pick a spot far from the stove, oven, dishwasher vent and heaters. Cool room temperature is the goal.
- 04
Check it each month
Smell the oil when you open a new bottle and again near the end. Note the lot number in case you need it.
Shelf life
How long does an opened bottle of C60 olive oil last?
The brand does not publish a shelf life for an opened bottle. We could not find one on the label panel, the product page or the sales page, so we will not guess.
In practice, the timing works in your favor. At the label serving of 2 mL a day, one 60 mL bottle is used up in 30 days. If you order a 3 or 6 bottle pack, keep the unopened bottles sealed in the dark and open one at a time. If you skip days and a bottle lasts much longer, check the smell before each use. For lot details, see our testing and quality page.
Spoilage
How can you tell if C60 olive oil has gone bad?
Use your nose first. Fresh oil with bacon flavor smells mild and savory. Rancid oil smells stale.
- A smell like crayons, putty, old nuts or paint
- Oil that looks thicker or darker than when you opened it
- Mold or bits floating on the oil
Olive oil can turn cloudy or form flakes in the cold. That usually clears at room temperature. Clouding from cold is not the same as spoilage.
If the oil smells off, do not use it. Call the order desk at +1 (302) 200-3480 to ask about the order.
On the road
How do you travel with C60 olive oil for your dog?
Pack it like medicine: dark, upright and with you. A 60 mL (2 fl oz) bottle fits in a carry-on liquids bag.
- Wrap the bottle in a sock or put it in a dark pouch.
- Seal it in a zip bag in case the dropper leaks.
- Keep it in your bag or the cabin, not in a hot trunk or on the dashboard.
- At a hotel or campsite, store it in a drawer or a shaded cooler, not in a sunny tent.
Bring the same food you use at home to mix it into. A new place plus a new topping can put a fussy dog off its meal. Our how to use page covers serving basics.
Accidents happen
What should you do if a bottle of C60 oil sat in the sun?
Do not give it to your dog. You cannot see or smell light damage in C60 oil, and the mouse study showed how serious it can be (Grohn et al., 2021).
Set it aside
Mark the bottle so nobody uses it by mistake. Keep it, with the lot number, for now.
Call the order desk
Ring +1 (302) 200-3480 with your order ID and ask what they can do.
Watch your dog
If your dog already had some, call your vet about any vomiting, diarrhea or tiredness.
Sources
Sources on storing C60 olive oil
Storage wording comes from the brand's product page, checked October 11, 2026.
- C60 in olive oil causes light-dependent toxicity and does not extend lifespan in mice. Grohn KJ, et al. GeroScience 43(2):579-591, 2021.No lifespan gain: median 144 vs 145 weeks (p=0.87) and 127 vs 130/128 weeks. C60 oil exposed to light for 4-8 days killed 25-50% of mice. Commercial products varied from 0.57 to 1.4 mg/mL.
- How to Report a Pet Food Complaint. U.S. Food and Drug Administration, 2024.Report through the Safety Reporting Portal with the lot number, best-by date, where you bought it, your pet's signs and vet records. Keep the packaging.
FAQ
C60 olive oil storage FAQ
Should C60 olive oil be refrigerated?
The Mighty K9 product page says only to store it in a cool and dark place; it does not say to refrigerate. A dark cupboard away from the stove is enough for most homes. Olive oil may turn cloudy in the fridge, which usually clears at room temperature.
Does light damage C60 oil?
It can. In a 2021 mouse study, C60 olive oil exposed to strong light for 4 to 8 days killed 25 to 50% of the mice given it, while light-protected oil did not. That is why amber glass and a dark cupboard matter for products like Mighty K9.
How long does Mighty K9 last once opened?
The brand does not publish a shelf life for an opened bottle. At the label serving of 2 mL a day, one 60 mL bottle is used up in 30 days. Keep it capped in a cool, dark place, and smell the oil before use if a bottle lasts longer.
How do I know if C60 olive oil is rancid?
Rancid oil smells stale, like crayons, putty, old nuts or paint. It may also look darker or thicker. If the oil smells off, do not give it to your dog. Call the order desk with your order ID to ask about the bottle.
Can I leave Mighty K9 in my car?
No. A parked car heats up quickly, and a dashboard or seat in the sun gets both light and heat. Carry the bottle in your bag, wrapped in something dark, and take it inside with you. Do not use a bottle that sat in a hot, sunny car.
Can I take C60 oil for my dog on a plane?
Yes. A 60 mL (2 fl oz) bottle fits in a carry-on liquids bag. Wrap it in a sock or dark pouch, seal it in a zip bag in case of leaks, and keep it in the cabin with you rather than in checked luggage that may sit in hot places.
Who wrote this
Written and reviewed by
Plain-language pages built from the label panel, the sales page and linked veterinary and public sources.
Last updated . Both our editorial standards and how we check reviews are open to read. This website is run by Themightyk9, the Mighty K9 U.S. shop and a stocking partner, not by the manufacturer. Buying through our order links earns us money.
Keep reading
More about Mighty K9
ESS60 (C60)
What C60 is, every study we found from rats to six beagles, and what is still unknown.
Read more
How to use
Measure, drizzle, mix: the daily routine, picky-eater tricks, travel and storage tips, and what to do after a missed day.
Read more
Testing & quality
What the GMP, Made in USA and organic claims mean, what lab proof is missing, and what to ask the maker.
Read moreMighty K9 U.S. shop, a stocking partner
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