Nuts & seeds · Food safety
Should peanut butter be refrigerated after opening?
Conventional peanut butter is often pantry-stable after opening, while natural or specialty products may call for refrigeration. The label is the final guide.
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Food safety
Food-safety guidance on handling, cooking, storage, spoilage signs and when food should be discarded.
Dairy & cheese · Food safety
How long does opened milk last? The carton date is not the whole story
Opening milk starts a new storage clock. Post-opening directions and continuous refrigeration matter more than a date designed for the sealed carton.
Meat · Food safety
How long does rotisserie chicken last in the fridge, and when should you toss it?
USDA recommends using refrigerated rotisserie or other cooked chicken within 3 to 4 days when it has been chilled promptly and kept at 40°F/4°C or below.
Vegetables & mushrooms · Food safety
Pre-washed salad: should you wash it again before eating?
FDA says pre-washed or ready-to-eat salad can be eaten without another wash. Clean handling and avoiding cross-contamination matter more than a second rinse.
Legumes & soy · Food safety
Does soy sauce need refrigeration after opening?
Regular soy sauce is relatively stable after opening, but refrigeration preserves flavor. Less-sodium and blended sauces may specifically require refrigeration.
Meat · Food safety
How Long Does Opened Deli Meat Last? It Depends on the Type
Opened moist lunch meats such as sliced ham, turkey, or bologna generally have a short refrigerated window, commonly 3–5 days. Dry-cured salami, prosciutto, and similar products can follow different product-specific rules, so identify the type and follow the label.
Seaweed, spices & more · Food safety
Does ketchup need refrigeration after opening?
Commercial ketchup is acidic and relatively stable, but refrigeration after opening is the best home routine for preserving color, flavor and quality.
Dairy & cheese · Food safety
Can butter stay out of the refrigerator?
Butter is more tolerant of brief room-temperature storage than many dairy foods, but refrigeration is the most predictable default, especially in a warm kitchen.
Dairy & cheese · Food safety
Can you freeze milk? Yes, but here is what changes
Milk can be frozen, but thawing may leave it separated or slightly grainy. Freeze it fresh, leave expansion space and thaw it in the refrigerator.
Fish & seafood · Nutrition & composition
Albacore vs light tuna: which usually contains more mercury?
Albacore usually contains more mercury than canned light tuna. Species and serving frequency matter most when tuna is a regular part of the diet.
Seaweed, spices & more · Comparisons
Apple Cider Vinegar vs White Vinegar: When to Use Each One
Apple cider vinegar brings fruitier flavor and amber color; distilled white vinegar is cleaner, sharper, and colorless. Many commercial versions are 5% acidity, but preservation recipes depend on verified acidity, so flavor preference never overrides a tested canning formula.
Seaweed, spices & more · Food safety
Does Vinegar Expire? Why It Can Change Without Spoiling
Commercial vinegar is unusually shelf-stable because its acidity discourages most spoilage organisms. It can become cloudy, develop sediment, or form a vinegar mother without being spoiled. For preservation, however, an old bottle still needs the known acidity required by the tested recipe.