Slow cooker bone broth turns a modest pile of bones and vegetables into a deeply savory, soothing cooking staple with very little hands-on work. The long, gentle simmer extracts flavor while you sleep, and the finished broth can be sipped warm, used as a base for soup, or added to grains and sauces. This version uses a practical mix of bones, aromatics, vinegar, and water, with clear cues for straining, chilling, and storing the broth safely.

What slow cooker bone broth is

Bone broth is a long-simmered stock made from bones, vegetables, and water. The slow cooker keeps the heat steady, which makes the process forgiving and convenient. Apple cider vinegar adds acidity to the cooking liquid; it also gives the broth a subtle brightness that balances the rich bone flavor. The finished liquid may gel when chilled or remain pourable depending on the bones and water ratio. Either texture is useful.

Why this method works

Low heat gives connective tissue time to soften without the aggressive bubbling that can make stock cloudy. Onion, carrot, celery, garlic, bay leaves, and peppercorns build a rounded savory base, while the vinegar keeps the flavor from tasting flat. Covering the bones with water matters because exposed bones can dry out and produce a weaker batch. Keep the cooker on low and top it up with hot water if the level drops noticeably.

How to make slow cooker bone broth

Recipe details

Set out a large slow cooker, a fine-mesh sieve, and a heatproof container before you begin. The recipe yields about 8 cups, although the exact amount depends on the size of your cooker and how much liquid evaporates.

Ingredients

3 lb beef or poultry bones, raw or roasted
1 large onion, quartered
2 carrots, roughly chopped
2 celery stalks, roughly chopped
2 tbsp apple cider vinegar
2 cloves garlic, smashed
2 bay leaves
1 tsp whole black peppercorns
Cold water, enough to cover the bones
1 tsp fine sea salt, optional and added after straining

Method

Place the bones, onion, carrots, celery, garlic, bay leaves, and peppercorns in a slow cooker.
Add the apple cider vinegar and enough cold water to cover the bones by about 1 inch. Let the mixture stand for 20 minutes.
Cover and cook on low for 18 to 24 hours, checking the water level occasionally and adding more hot water if needed to keep the bones covered.
Strain the broth through a fine-mesh sieve into a large heatproof container. Discard the solids and season with salt if desired.
Cool promptly, refrigerate, and skim the solidified fat from the surface before serving or storing.

Serving ideas

Warm a mug of broth and season it with a little salt, black pepper, or a squeeze of lemon. Use it wherever you would use stock: simmer rice, couscous, beans, or lentils in it; loosen a pan sauce; or add it to a vegetable soup. For a quick meal, stir shredded chicken, cooked noodles, and greens into hot broth. The flavor is concentrated enough to support other ingredients without overpowering them.

Tips and an optional variation

Roasted bones give the broth a darker, toastier flavor, while raw poultry bones make a lighter broth. Avoid salting heavily at the beginning because the liquid reduces during cooking. For the clearest result, strain gently instead of pressing the vegetables and bones through the sieve. A useful tip is to cool the strained broth in shallow containers so it passes through the warm temperature range quickly.

Optional variation: Add a small sprig of fresh thyme during the last 2 hours of cooking for a herbal note. Remove it with the other solids. This is optional and does not change the primary recipe.

Storage and reheating

Refrigerate the broth promptly in covered containers and use it within several days. For longer storage, freeze it in measured portions, leaving room for expansion. Ice cube trays are handy for sauces and small amounts; larger containers work better for soups. Reheat only the portion you plan to use, bringing it to a steaming temperature. If a fat cap forms in the refrigerator, lift it off for a cleaner broth or stir a little back in for added richness.

Slow cooker bone broth FAQ

How long should bone broth cook?

This recipe uses 18 to 24 hours on low. The broth is ready when it smells deeply savory, the vegetables are spent, and the liquid has a full flavor. Longer cooking is not automatically better if the water level is allowed to fall too far.

Can I use different bones?

Yes. Beef bones create a robust broth, poultry bones create a lighter one, and a mixture gives you a middle ground. Use bones that fit comfortably in the cooker and keep them covered with water.

Why did my broth not gel?

Gelation depends on the amount of collagen-rich connective tissue, the water ratio, and how much the broth reduces. A broth that stays liquid is still useful and flavorful. Chill it before deciding how concentrated it is.

Do I need to roast the bones first?

No. Roasting is optional and adds browned flavor; the recipe works with raw bones as well.

When should I add salt?

Add salt after straining so you can taste the final concentration and avoid an overly salty reduced broth.

What is the easiest use for leftover broth?

Warm it as a drink, or use it to cook rice, grains, beans, or noodles in place of water.

How do I keep the broth from becoming cloudy?

Keep the cooker on low, avoid vigorous boiling, and strain gently through a fine-mesh sieve.

Once strained and chilled, this slow cooker bone broth is ready to portion for the week. Keep the seasoning restrained, store it promptly, and let the broth do double duty as both a comforting sip and a flavorful foundation for everyday cooking.