After you open your coffee mate creamer, how long is it good for?
Most liquid dairy creamers are at their best for 7 to 14 days after opening, even if refrigerated. "Mature" creamers (those kept 2–4 weeks) may still be safe but often show physical changes.
As liquid creamers age, they may thicken. This "maturity" can be caused by temperature fluctuations that cause fats to solidify or oils to separate.