Kirkland Signature (Costco)
ProCare
Our verdict
The best pure value in American formula: a dual-HMO, no-palm-oil, all-lactose recipe that mirrors Similac's approach at roughly a third of the price. The catches are real but livable — you need a Costco membership, and the powder is a stubborn clumper that rewards patient mixing. If budget matters at all, start here.
Score breakdown
What's great
- Exceptional value: roughly $0.55-$0.71 per ounce, about a third of the per-ounce price of Similac/Enfamil
- No palm olein oil - same fat-blend approach as Similac
- 100% lactose carbohydrate source
- Wirecutter-recommended; 4.7-star average across 3,100+ Costco reviews
- Large 42-oz cans mean fewer repurchases
- Consumer Reports contaminant testing flagged Kirkland Signature among lower-risk formulas
Worth knowing
- Requires a Costco membership (in-warehouse or costco.com)
- Recurring complaint: powder clumps and doesn't fully dissolve no matter how much you shake
- Only one variety - no sensitive, gentle, or ready-to-feed options under the ProCare infant line
- Not sold through regular retail channels; Amazon stock is third-party resellers at marked-up prices
What's in it
| Protein | Nonfat milk and whey protein concentrate (about 52:48 whey-to-casein ratio) |
| Carbs | Lactose |
| Fats | High oleic sunflower and safflower oil, soy oil, coconut oil (no palm olein oil) (no palm oil) |
| Key features | Dual HMO prebiotics: 2'-FL and LNnT · DHA for brain development and lutein for eye development · No palm olein oil · Non-GMO, gluten-free, Kosher (OU-D) and Halal certified · Iron-fortified; made by Perrigo, the largest US store-brand formula manufacturer |
| Stage | 0-12 months |
| Forms | powder |
| Where to find it | Costco warehouses and Costco.com only (typically sold online as a 42-oz 2-pack around $48.99-$51.99); third-party resellers on eBay/Amazon at markup |
Note: Price basis: Costco.com 2-pack commonly $48.99-$51.99 ($24.50-$26.00 per 42-oz can, ~$0.58-$0.62/oz); single cans reported at $29.99 in-warehouse ($0.71/oz) and one 2026 roundup cites $22.99. No first-party Amazon listing observed, so no ASIN recorded. Made by Perrigo in FDA-inspected US facilities.
Best for
What parents say
Recurring themes we found across public parent discussions (Costco.com product reviews (4.7 stars, 3,100+ reviews, item 100810650), NewModernMom hands-on comparison (mixing/clumping observations), Slickdeals Kirkland ProCare deal threads and comments, BLW Store and YourBestDigs Similac vs Kirkland comparisons; Wirecutter recommendation cited in search results, Note: direct r/FormulaFeeders threads did not surface in web search results; themes are from the public review sources above) — not reviews submitted on this site.
Loved
- Massive savings vs name brands with a near-identical ingredient list to Similac Pro-Advance/360
- Babies switch from Similac with no issues, since both avoid palm oil and use lactose
- High trust in Perrigo manufacturing and Costco quality reputation
Common complaints
- Clumping/poor dissolving is the most consistent complaint across reviews and hands-on tests
- Frustration that it periodically sells out or is limited to 2-pack online purchases
- Membership requirement is a barrier for non-Costco households
Common questions
Who makes Kirkland Signature ProCare formula?
Perrigo, the largest US store-brand formula manufacturer, in FDA-inspected US facilities. Perrigo also makes formulas sold under many other retailers' store brands.
Is Kirkland ProCare really comparable to Similac?
Its ingredient approach closely mirrors Similac's routine formulas: lactose as the only carb, no palm olein oil, dual HMO prebiotics, plus DHA and lutein. All US formulas must meet identical FDA nutrient requirements — the recipes differ mainly in extras, and here they barely do.
Why does Kirkland formula clump?
Clumping and incomplete dissolving are the most consistent complaints in reviews. Using slightly warm water, adding powder to water (not the reverse), and swirling before shaking helps.
Reviews from parents like you
Real submissions from readers — moderated for spam, never edited for opinion.
Loading reviews…