Costco's own Kirkland Signature Greek Yogurt ties five name-brand yogurts at a perfect 100: siggi's Simple Ingredient Skyr, Fage Total 2% Milkfat, Chobani Greek Yogurt Nonfat Plain, Maple Hill's Greek Yogurt Plain Unsweetened, and Two Good's Plain Yogurt. The one product below 100 is Icelandic Provisions' Vanilla Bean Oatmilk Skyr, which scores 80 after three deductions.
| Product | Brand | Score | Verdict | Biggest deduction |
|---|---|---|---|---|
| Greek Yogurt Plain | Kirkland Signature | 100 | ✅ Approved | None |
| Simple Ingredient Skyr Plain | siggi's | 100 | ✅ Approved | None |
| Total 2% Milkfat | Fage | 100 | ✅ Approved | None |
| Greek Yogurt Nonfat Plain | Chobani | 100 | ✅ Approved | None |
| Greek Yogurt Plain Unsweetened | Maple Hill | 100 | ✅ Approved | None |
| Two Good Plain Yogurt-Cultured Ultra-Filtered Milk | Two Good | 100 | ✅ Approved | None |
| Vanilla Bean Oatmilk Skyr | Icelandic Provisions | 80 | ✅ Approved | Sugar or syrup in first 3 ingredients (−10) |
Kirkland Signature's Greek Yogurt is nonfat milk and live cultures. That reads the same as the name-brand plain Greek yogurts on this list, and nothing is flagged.
siggi's Simple Ingredient Skyr, Fage's Total 2% Milkfat, and Chobani's Greek Yogurt Nonfat Plain follow the same pattern: milk (and cream, for Fage) plus live cultures. Short plain labels like these leave little for the Standard to flag.
Maple Hill's Greek Yogurt Plain Unsweetened is organic grass-fed milk and live cultures. Two Good's Plain Yogurt adds water, tapioca starch, lemon juice concentrate, gellan gum and vitamin D3 to cultured milk. None of those is on the Standard's flag list, so both score 100.
Icelandic Provisions' Vanilla Bean Oatmilk Skyr is an oat-milk skyr with three deductions. Its first ingredient is the oat-milk base, and cane sugar is listed inside it, so the sugar-in-the-first- three rule costs 10 points. It also loses 5 for "natural flavors" that aren't identified, and 5 because its 12 ingredients cross the more-than-10 line.
Every score above comes from The AisleScore Standard v1.3, applied the same way to Costco's private label and the national brands beside it. Plain yogurt and skyr have short labels, which is why six of the seven products here score 100. Icelandic Provisions' 20-point gap comes from three rules: sugar or syrup in the first three ingredients (−10, which counts sugar inside a compound ingredient), the natural-flavors rule (−5) and the ingredient-count rule (−5 once a label passes 10 ingredients). None of them is a hard disqualifier like an artificial dye or a seed oil.
Scores on this page are auto-scored from Open Food Facts data against The AisleScore Standard v1.3 and have not been hand-verified by AisleScore unless a product says "Hand-verified on [date]". Check the current package.
AisleScore doesn't track which stores carry each product, so check what your Costco has on the shelf. A store brand tying name brands at 100 is the kind of result this project exists to show: the score comes from the ingredient list, not the front of the tub. If you've checked a container and the receipt doesn't match, subscribe to the AisleScore newsletter and tell us.