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Kirkland Signature ProCare vs Member's Mark Advantage Premium
In independent testing, Member's Mark Advantage Premium showed lower heavy-metal levels overall (purity 93 vs 86). The full lab numbers, metal by metal:
| Purity score | 86A | 93A |
| Lead ppb | 1.7 | 1.4 |
| Aluminum ppb | 1,143 | 251 |
| Price | $0.48/oz | $0.46/oz |
| Est. cost at 28 oz/day | $2.07/day | $1.99/day |
| Origin | US | US |
| Base | Cow's milk | Cow's milk |
| Buy | Buy |
Kirkland SignatureProCare
Member's MarkAdvantage Premium
Lab data: Consumer Reports independent testing, March 2025. Purity scores are relative to the tested cohort — methodology. Not medical advice; consult your pediatrician.