10 Healthy Grocery Staples Worth Buying at Costco

Costco has a loyal following for good reason — the per-unit pricing on quality products is hard to beat, and the Kirkland Signature line consistently punches above its price point. But the warehouse format works against you if you’re not selective. Buy the wrong things and you’re throwing away food, not saving money.

The items on this list earn their place because they combine genuine nutritional value with long shelf lives or high household turnover, and because Costco’s pricing on them is meaningfully better than what you’d find elsewhere. These are the staples that justify the membership.

---

1. Kirkland Signature wild Alaskan salmon (frozen)

Costco’s wild Alaskan sockeye salmon — sold as individually vacuum-sealed fillets in a large bag — is one of the best deals in the entire store. Sockeye is particularly rich in omega-3 fatty acids, astaxanthin (a potent antioxidant that gives the flesh its deep red color), vitamin D, and protein. Wild-caught matters here: farmed salmon has a different fatty acid profile and is often raised with antibiotics and synthetic colorants.

Per pound, Costco’s wild sockeye runs significantly below what comparable quality costs at a fish counter or specialty grocer. The individual sealing means no waste — pull out what you need and leave the rest frozen.

---

2. Kirkland Signature organic extra virgin olive oil

The Costco two-pack of organic EVOO is a perennial best buy. Third-party testing has repeatedly confirmed that Kirkland’s olive oil is authentic and meets extra virgin standards — something that can’t be said for every brand on a grocery store shelf. High-quality EVOO is rich in oleic acid and oleocanthal, a naturally occurring compound with anti-inflammatory properties similar in mechanism to ibuprofen, just at much lower levels.

Buy the two-pack only if you’ll use both bottles within six months. Olive oil oxidizes over time and loses flavor and beneficial compounds. Store away from heat and light.

---

3. Organic rotisserie chicken

Costco’s rotisserie chicken is famous on price alone — it’s been held at $4.99 for years. The organic version, where available, steps it up nutritionally. A single bird provides multiple high-protein meals and the carcass makes excellent bone broth if you’re inclined. Protein per dollar, it’s nearly impossible to beat.

Rotisserie chicken works as a shortcut for meal prep: shred it while warm and use it across grain bowls, salads, soups, tacos, or sandwiches through the week. The organic designation means no antibiotics and feed free of synthetic pesticides.

---

4. Organic baby kale or power greens blend

Costco sells large containers of organic mixed greens — often a kale, chard, and spinach blend marketed as a power greens mix — at prices well below what smaller bags cost per ounce at a conventional grocer. Kale is one of the most nutrient-dense foods available: extremely high in vitamins K, C, and A, along with calcium, manganese, and glucosinolates — sulfur-containing compounds associated with cancer risk reduction in research literature.

The large container only makes sense if your household uses greens daily. Smoothies, salads, sautéed with garlic, stirred into soups — build the habit first, then buy the bulk size.

---

5. Kirkland Signature almond butter

Costco’s almond butter — typically a two-jar pack — is made from dry-roasted almonds with no added oil, sugar, or hydrogenated fats. Almonds are one of the most micronutrient-rich nuts: high in vitamin E, magnesium, calcium, and monounsaturated fats, with a favorable effect on LDL cholesterol in clinical studies.

Natural nut butter separates in the jar (oil rises to the top) — stir it once when you open it, then store it upside down in the fridge to keep the consistency even. The two-pack holds well refrigerated and the per-ounce price is roughly half what a single jar costs at a grocery store.

---

6. Organic ground turkey (bulk pack)

Costco’s bulk packs of organic ground turkey are a practical high-protein staple for households that meal prep regularly. Ground turkey is lean, mild enough to take on whatever seasoning you use, and works across a wide range of dishes — turkey meatballs, taco filling, bolognese, stuffed peppers, lettuce wraps. It’s lower in saturated fat than ground beef while delivering comparable protein.

Portion and freeze immediately when you get home. One-pound portions in labeled freezer bags thaw overnight in the fridge and cook from there identically to fresh.

---

7. Frozen organic açaí packets

Costco carries Sambazon organic açaí packets — unsweetened — at prices that make regular use realistic. Açaí has one of the highest antioxidant ratings of any food measured, driven largely by its anthocyanin content. It’s also a rare fruit that contains meaningful healthy fats (similar fatty acid profile to olive oil) alongside fiber and plant sterols.

The unsweetened packets are the only ones worth buying. Add a frozen banana, some frozen blueberries, and almond milk and you have a legitimate nutrient-dense breakfast in under two minutes. Avoid the pre-sweetened smoothie packs — they add sugar that offsets the nutritional benefit.

---

8. Canned organic beans (variety case)

Costco sells cases of organic canned beans — black beans, chickpeas, kidney beans, and sometimes a variety mix — that work out to well under a dollar per can at bulk pricing. Beans are one of the most underrated foods in terms of nutritional return: high in plant protein, soluble and insoluble fiber, folate, iron, and resistant starch (which feeds beneficial gut bacteria and blunts blood sugar response).

Rinse before using to cut sodium content significantly. From there they go into almost anything. A case lasts months in the pantry and keeps you from reaching for less nutritious convenience options when you need something fast.

---

9. Kirkland Signature omega-3 fish oil

This crosses into supplements rather than whole food, but Costco’s Kirkland fish oil is worth including because third-party testing consistently ranks it among the best value options for EPA and DHA — the active omega-3 compounds. The softgels are molecularly distilled (reducing heavy metal contamination risk), and the dosage per serving is competitive with products that cost three times as much at a pharmacy.

Omega-3 supplementation has meaningful evidence behind it for cardiovascular health, triglyceride reduction, and inflammation modulation — particularly for people who don’t eat fatty fish two or more times per week. Keep the bottle in the fridge after opening to slow oxidation.

---

10. Organic whole grain oats (large canister)

Costco’s large canisters of old-fashioned rolled oats are one of the most straightforward bulk buys available. Plain oats are high in beta-glucan — a soluble fiber with well-documented effects on LDL cholesterol and blood sugar regulation — along with iron, magnesium, zinc, and B vitamins. They’re versatile, shelf-stable for over a year when stored properly, and genuinely filling.

The key is buying plain oats, not the flavored instant packets. Steel-cut oats are available at some Costco locations and have a slightly lower glycemic impact, though old-fashioned rolled oats are nutritionally close and far more convenient on a weekday morning.

---

What not to load into the cart

Costco is also home to some of the most misleading health halos in retail. The oversized muffins, the “protein” granola bars with 25 grams of added sugar per serving, the giant bags of trail mix that are 60 percent candy pieces, the flavored yogurt multi-packs with more sugar than a soda — all of it is packaged to look like a smart buy and nutritionally lands closer to junk food.

The warehouse format amplifies bad decisions. A bad purchase at Costco isn’t one box of cookies — it’s four pounds of them. Buy with intention.

---

The bottom line

Costco rewards members who shop with a list and stick to it. Wild salmon, organic olive oil, almond butter, power greens, bulk beans, and plain oats are all genuinely better deals in the warehouse format — real food with real nutritional value at prices that justify buying in volume. Get those right and the membership card more than pays for itself.