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.
While not a technical grade, "mature" often describes liquid creamers that have been opened for an extended period or are past their peak freshness. mature wet creamers
After you open your coffee mate creamer, how long is it good for? Most liquid dairy creamers are at their best
If a creamer is too "mature" (spoiled), it will exhibit clear warning signs: these emulsions can break down
Liquid creamers are oil-in-water emulsions. Over time, these emulsions can break down, leading to a "mature" appearance where the liquid looks unappetizingly mixed with visible fats or sugars. Signs of Over-Mature or Spoiled Creamer