By CostcoFan | Updated June 2026
Item #453914 | Cumberland Swan Hydrogen Peroxide 3% | 2 x 32 oz | $2.79 (previously $1.99) | FSA/HSA Eligible
We always have hydrogen peroxide in the house. Always. At $2.79 for 2 full-size bottles, there’s no reason not to. This is one of those Costco items that costs almost nothing, lasts for months, and does a dozen things you didn’t know it could do.
We use ours primarily for cleaning — the kitchen sink, the dishwasher, cutting boards, and countertops. My go-to move: pour hydrogen peroxide into a spray bottle, mist the kitchen sink and drain, let it sit for 10 minutes, then rinse. The sink looks brand new and the drain smells fresh. No chemical cleaners needed. For the dishwasher, I pour about half a cup into the bottom of an empty machine and run a hot cycle. It removes the film and odor buildup that regular detergent misses.
If you’ve never thought to buy hydrogen peroxide at Costco, here’s why you should.
This article contains affiliate links. As an Amazon Associate, CostcoFan earns from qualifying purchases at no additional cost to you.
What You’re Getting
Cumberland Swan 3% Hydrogen Peroxide, 2-pack of 32 oz bottles (64 oz total) for $2.79. That’s $0.04 per ounce. A single 32 oz bottle at Walgreens or CVS runs $3-5 on its own. You’re getting 2 bottles at Costco for less than 1 costs at a drugstore.
Active ingredient: Hydrogen peroxide 3% (stabilized)
Inactive ingredient: Purified water
That’s it. Two ingredients. No fragrances, no dyes, no additives. It breaks down into water and oxygen after use, making it one of the most environmentally friendly cleaning agents available.
Drug Facts label uses:
- First aid antiseptic
- Oral debriding agent (gargle/rinse)
FSA/HSA Eligible: Yes. You can purchase this with your Flexible Spending Account or Health Savings Account tax-free. Check with your benefits provider for details.
10 Ways We Actually Use It
Hydrogen peroxide is one of the most versatile products in the house. Here’s how we use ours:
Kitchen sink and drain: Pour directly into the drain or spray on the sink basin. Let it fizz for 10 minutes, then rinse with hot water. Kills bacteria, removes odors, and makes stainless steel shine. We do this once a week.
Dishwasher cleaning: Pour half a cup into the bottom of an empty dishwasher. Run a hot cycle. Removes film, mildew, and odor buildup from the interior, spray arms, and door gasket.
Cutting board sanitizer: After washing your cutting board with soap, spray or pour hydrogen peroxide across the surface. Let it sit for 5 minutes, rinse. Kills bacteria that soap alone can miss — especially important after cutting raw meat.
Countertop disinfectant: Spray on granite, quartz, or laminate countertops, wipe with a clean cloth. Safe on most hard surfaces. Avoid on marble — the acidity can etch natural stone over time.
Teeth whitening paste: Mix hydrogen peroxide with baking soda to form a paste. Brush gently for 2 minutes. This is a well-known DIY whitening method. Don’t swallow it and don’t do it daily — 2-3 times per week max to avoid enamel sensitivity.
Mouth rinse / gargle: Dilute 1 part hydrogen peroxide with 2 parts water. Gargle for 30 seconds and spit. Helps with minor mouth sores and sore throats. This is an FDA-listed use on the drug facts label.
Laundry brightener: Add half a cup to the bleach dispenser with your regular detergent. Brightens whites and removes organic stains (blood, sweat, wine, coffee) without the harshness of chlorine bleach. Safe for colors at 3% concentration.
Stain remover: Apply directly to fresh stains on clothing or carpet. Let it sit for 5-10 minutes before blotting. Works particularly well on blood, wine, and food stains. Test on a hidden area first with colored fabrics.
Toothbrush sanitizer: Drop toothbrushes into a cup of hydrogen peroxide for 5 minutes. Rinse with water. Kills bacteria that accumulate between brushings.
Fruit and vegetable wash: Add a quarter cup to a bowl of cold water. Soak produce for 5 minutes, then rinse thoroughly. Helps remove surface bacteria and pesticide residues more effectively than water alone.
A Note About Cuts and Scrapes
You probably grew up with your parents pouring hydrogen peroxide on every cut and scrape. The fizzing made it feel like it was working. Here’s the truth: medical professionals no longer recommend hydrogen peroxide for wound care. While it does kill bacteria, it also damages healthy tissue cells around the wound and can slow healing. For cuts and scrapes, clean water and mild soap followed by antibiotic ointment and a bandage is the current recommendation.
This doesn’t make hydrogen peroxide useless — far from it. It just means its best uses are for cleaning surfaces, brightening laundry, and oral care rather than wound treatment. The 10 uses listed above are all more effective applications than pouring it on a scraped knee.
Costco Pricing History
- 2020-2021: $1.99 for the 2-pack
- 2024-2025: $2.49-2.69
- 2026: $2.79
Even at $2.79, this remains one of the cheapest products at Costco and one of the best values on a per-use basis. You’ll get months of cleaning, laundry brightening, and oral care from a single 2-pack. The 40% price increase from $1.99 to $2.79 over 5 years is noticeable but still puts Costco well below drugstore pricing for the same quantity.
Where to Find It at Costco
Look in the health and pharmacy section, usually on the bottom shelf near the rubbing alcohol, cotton balls, and first aid supplies. It’s easy to walk right past — the bottles are small and the shelf placement isn’t prominent. If you don’t see it, ask an employee. Some stores stock it in different locations depending on the layout.
Frequently Asked Questions
How much is hydrogen peroxide at Costco?
$2.79 for a 2-pack of 32 oz bottles (Item #453914). That’s $0.04 per ounce — significantly cheaper than drugstore pricing of $3-5 for a single bottle.
Is Costco hydrogen peroxide FSA eligible?
Yes. Hydrogen peroxide is eligible for purchase with FSA and HSA accounts.
What concentration is the Costco hydrogen peroxide?
3%, which is the standard household concentration. Safe for all of the uses listed above. Higher concentrations (6%, 12%, 35%) are available online for industrial or specialized use but require careful handling and dilution.
Can I use hydrogen peroxide on cuts?
Medical professionals no longer recommend it for wound care as it can damage healthy tissue and slow healing. Use clean water, mild soap, and antibiotic ointment instead. Hydrogen peroxide is better used for surface cleaning, laundry, and oral care.
Does hydrogen peroxide expire?
Yes. Unopened, it lasts about 3 years. Once opened, it remains effective for about 6 months. After that, it gradually breaks down into plain water and loses its cleaning and antiseptic properties. Store in a cool, dark place and keep the cap tightly sealed.
Where to Buy
Costco In-Store: $2.79 for 2 x 32 oz (Item #453914) — Health/pharmacy section, bottom shelf
If you need a different concentration or larger quantity:
MAXTITE 3% Hydrogen Peroxide Solution, 1 Gallon on Amazon → Same 3% concentration as the Costco bottles but in a 1-gallon jug. Food-grade, made in USA. Good option if you go through hydrogen peroxide quickly for cleaning.
MAXTITE 12% Hydrogen Peroxide Solution, 1 Gallon on Amazon → Higher concentration for heavy-duty cleaning, laundry whitening, and outdoor surface cleaning. Must be diluted before use. Not for oral care or first aid at this concentration.
HARRIS Hydrogen Peroxide Ready to Use, 128 oz on Amazon → Pre-diluted, ready-to-use formula with included funnel for easy pouring. 1 gallon. For household cleaning on kitchen, bath, and laundry surfaces.
(As an Amazon Associate, CostcoFan earns from qualifying purchases.)
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This article contains affiliate links. As an Amazon Associate, CostcoFan earns from qualifying purchases at no additional cost to you. CostcoFan is not affiliated with Costco Wholesale Corporation or Cumberland Swan.
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