For a healthy adult guinea pig, the best food is a plain timothy-hay-based pellet with stabilized vitamin C, bought in a bag small enough that you finish it while the vitamin C is still good. My pick is Oxbow Essentials Adult. If you want to spend less, Kaytee Timothy Complete does the job. If you want a fresher, no-filler bag and don’t mind ordering online, Small Pet Select is the premium option.
The pellet is the small part of the diet. Hay is the meal. So the honest answer to “what’s the best guinea pig food” is really two things at once. Pick a decent pellet, then get the hay and veg right. I’ll cover all of it below, plus the mixes you should walk past on the shelf, and the age-specific stuff (young, adult, senior) that trips people up.
Quick picks
- Best overall: Oxbow Essentials Adult Guinea Pig Food. Timothy base, stabilized vitamin C, the one I’d hand a first-time owner.
- Best value: Kaytee Timothy Complete. Cheaper, easy to find, has added probiotics.
- Best premium: Small Pet Select Guinea Pig Food. High-fiber, no fillers, ships fresh.
- Best for young/pregnant/nursing: Oxbow Essentials Young Guinea Pig Food (alfalfa-based, higher protein).
- Best natural: Oxbow Garden Select (no artificial colors, flavors or preservatives).
Comparison table
Real numbers, so you can actually compare. Fiber and protein are typical guaranteed-analysis figures off the bag; prices bounce around, so treat them as ballpark.
| Product | Base | Crude fiber (min) | Protein | Vitamin C | Bag size | Approx price | Best for |
|---|---|---|---|---|---|---|---|
| Oxbow Essentials Adult | Timothy | ~25% (up to ~29%) | ~12-14% | Stabilized, added | 5 lb | Healthy adults, all-round pick | |
| Kaytee Timothy Complete | Timothy | ~25% (up to ~29%) | ~14% | Added | 5 lb | Value, wide availability | |
| Small Pet Select | Timothy | High (~25-32%) | ~13% | Fortified (A, D, E + C) | 5 lb | Premium, no fillers, freshness | |
| Oxbow Essentials Young | Alfalfa | ~20-23% | ~18% | Stabilized, added | 5 lb | ~$13 | Under 6 months, pregnant, nursing |
Notice how close Oxbow and Kaytee sit on paper. The gap between them is smaller than the gap between any plain pellet and a colorful “gourmet” mix, which is the choice that actually matters.
What makes a good guinea pig food
Ignore the front of the bag. Flip it over and read the ingredients and the guaranteed analysis. Here’s what I look for.
Timothy hay as the first ingredient. For adults, timothy is the staple. It keeps calcium and protein at the right level. If the first ingredient is alfalfa, that bag is meant for babies or pregnant sows, not your grown pig.
Fiber, minimum ~18%. Higher is fine and often better, and the better adult pellets run well above this. Fiber keeps the gut moving. Guinea pig digestion is the kind of system that gets into trouble when it slows down, so fiber isn’t optional.
Stabilized vitamin C, and a fresh bag. This is the one people miss. Guinea pigs can’t make vitamin C, so pellets get it added. But that vitamin C is fragile. It degrades with heat, light and moisture, and a fortified pellet is generally only counted as fully potent for about 90 days from the mill date. So two rules: buy the smallest bag you’ll finish in a few weeks, and check the date stamp. Store it sealed and cool, not in a sunny spot on top of the cage. Don’t rely on pellets alone for vitamin C anyway. Fresh bell pepper is a better daily source.
Moderate protein, ~12-14% for adults. Adults don’t need a lot. The high-protein formulas exist for a reason, but that reason is young and breeding pigs, not a normal grown guinea pig.
Low calcium for adults. Too much calcium over time is linked to bladder sludge and stones. This is the main reason healthy adults come off alfalfa.
Uniform pellets, nothing else in the bag. No seeds, no corn, no dried fruit, no dyed shapes. If you can pick individual “treats” out of the bag by hand, that’s a bag to avoid. More on why below, because this is the single most common mistake I see.
Foods and ingredients to avoid
This section matters more than the pellet ranking.
Skip the muesli-style mixes: the colorful blends of pellets with seeds, corn, peas, banana chips and dyed pieces. They look generous, but the mix invites selective feeding. Guinea pigs are selective eaters: given a mix, a pig picks out the sugary, fatty bits and leaves the plain fiber pellets behind. This is called selective feeding, and it wrecks the whole point of a “complete” food. Your pig eats the candy and skips the vegetables. The vitamins A, D, E and C that were supposed to be spread evenly across every bite end up in the pieces left in the bowl.
This causes weight gain, a poor coat, and too little fiber for healthy digestion. The fatty extras cause their own problems: sunflower seeds and nuts are too rich, and the hard bits can lodge in a guinea pig’s teeth. Corn and dried fruit are basically sugar.
So: plain uniform pellets only, one color, one shape. If a food is marketed as “gourmet,” “garden medley with treats,” or shows a rainbow of pieces on the front, put it back. A boring bag of beige pellets is what you want.
Life-stage feeding: young vs adult vs senior
Age changes the food. This is where the alfalfa-vs-timothy question actually lives.
Young pigs (under ~6 months), pregnant and nursing sows. These pigs need more protein and more calcium for growth and milk. That’s what alfalfa-based food is for. An adult timothy formula is not enough for them. Feed an alfalfa-based junior formula like Oxbow Essentials Young, which runs around 18% protein against ~13% for the adult version.
Adults (6 months and up). Switch to a timothy-based adult pellet. Lower protein, lower calcium, more fiber. This is the standard state for most of a guinea pig’s life. Alfalfa now becomes an occasional treat at most, because the extra calcium adds up toward bladder stones over the years.
Seniors. Same timothy base. Don’t overthink it. The pellet usually doesn’t change. What changes is that you watch weight more closely. A senior that’s holding weight stays on the adult formula. A senior that’s losing weight needs help, and that’s often where leafier hay comes in (3rd-cut timothy has more leaf and a bit more protein and fat), or vet-approved alfalfa on the side for extra calories. Important caveat: weight loss in an old guinea pig is rarely just about the food. Dental overgrowth and kidney issues show up this way too, so an unexplained drop is a vet appointment, not a solo food experiment.
Best guinea pig food brand: Oxbow vs Kaytee vs Small Pet Select
People search “best guinea pig food brand” like the brand is the answer. It mostly isn’t. All three of these use a timothy base and add vitamin C. The formula (adult vs young) matters more than the logo. But here’s how they actually differ.
Oxbow. The default recommendation, and for good reason. Widely stocked, vet-familiar, clean ingredient list, distinct Adult and Young formulas so you’re not guessing. Around $12 for 5 lb. If you want one answer and no research, this is it.
Kaytee Timothy Complete. The value pick, roughly $10 for 5 lb, and it’s in basically every pet store, which matters when you run out on a Sunday. It adds probiotics and prebiotics for digestion. On paper it’s very close to Oxbow. It’s a genuinely fine food that gets unfairly overlooked because it’s cheap. Just make sure you grab “Timothy Complete” and not one of Kaytee’s mixed “Fiesta” style products, which are exactly the seed-and-color bags to avoid.
Small Pet Select. The premium option, around $15 for 5 lb, mostly sold online. The pitch is freshness and a high-fiber, no-filler recipe. In practice bags do tend to arrive fresher than store stock that’s been sitting under lights, which given the vitamin C shelf-life issue is a real advantage, not just marketing. The downside is price and that you have to plan ahead to order it.
My take: Oxbow if you want the safe default, Kaytee if you want to save money without cutting corners, Small Pet Select if freshness and quality are worth a couple extra dollars to you.
The reviews
Oxbow Essentials Adult Guinea Pig Food (best overall)
This is the one I point new owners to. It’s a timothy-hay-based pellet built specifically for adult guinea pigs, with stabilized vitamin C baked in. Crude fiber sits around 25% minimum (the guaranteed analysis lists a max near 29%), protein is a moderate ~12-14%, and calcium is kept low, which is exactly the profile a grown pig wants. The pellets are uniform, one color, no seeds or junk, so there’s nothing for a picky pig to sort around.
What sells it for me is that Oxbow ships a separate Young formula, so the Adult bag is genuinely tuned for adults rather than being a one-size compromise. It’s vet-familiar and easy to find. Downside? It’s a dollar or two more than Kaytee, and like every fortified pellet its vitamin C fades, so don’t buy the giant bag thinking you’re saving money. You’ll be feeding stale vitamin C by the end.
Key features: timothy-hay base, stabilized vitamin C, ~25% min fiber, ~12-14% protein, low calcium, uniform pellets, distinct adult formula.
Kaytee Timothy Complete (best value)
Kaytee’s Timothy Complete is the food I’d buy if I were watching the budget, and I wouldn’t feel like I was compromising. It’s timothy-based, fortified with vitamin C, and runs about $10 for a 5 lb bag, a bit cheaper than Oxbow. Protein is around 14%, crude fiber around 25% minimum. It also folds in probiotics and prebiotics, which is a nice touch for gut health. The pellets are uniform, so no selective-feeding problem.
The one thing to get right: buy the correct product. Kaytee also sells mixed “Fiesta” and “Forti-Diet gourmet” style bags loaded with seeds and colored pieces, and those are the ones to skip. “Timothy Complete” is the plain pellet you want. Beyond that, it’s hard to fault at the price. The biggest knock is just that it’s a touch less premium-feeling than the others, which is not something your guinea pig cares about.
Key features: timothy-hay base, added vitamin C, ~14% protein, ~25% min fiber, probiotics/prebiotics, ~$10 for 5 lb, sold everywhere.
Small Pet Select Guinea Pig Food (best premium)
Small Pet Select is the upgrade pick. High-fiber timothy base, no fillers, and fortified with vitamins A, D and E alongside C. The recipe leans hard into fiber, which is what you want, and the ingredient list is clean. It runs around $15 for 5 lb, so it’s the priciest of the three.
The real reason to pay up isn’t a magic ingredient, it’s freshness. Because vitamin C degrades on the shelf, a bag that arrives fresh from a smaller online supplier can genuinely be better than one that’s spent months under fluorescent store lights. That’s a legitimate edge here. The tradeoffs: it costs more, and you have to order ahead instead of grabbing it on a store run. If you’re organized and want the best bag, this is it. If you tend to run out and buy in a hurry, Oxbow or Kaytee will serve you better.
Key features: high-fiber timothy base, no fillers, fortified with vitamins A, D, E and C, ships fresh, premium price.
How pellets actually fit the diet
Since “good food for guinea pigs” is bigger than pellets, here’s the whole plate.
Hay, unlimited, roughly 80% of the diet. Grass hay (timothy for adults) should be in front of your pig all day, every day. It grinds down their constantly-growing teeth and keeps the gut running. This is the meal. Everything else is a side. Keeping it dry and off the cage floor helps, and a decent rack or storage setup pays for itself.
Pellets, about 1/8 cup per adult per day. That’s it. One eighth of a cup. Pellets are a nutritional backstop and a vitamin C source, not a bowl you keep topped up. Free-feeding pellets is how pigs get fat and skip their hay.
Fresh veg, about 1 cup a day. This is where a lot of the daily vitamin C comes from. Bell peppers are among the richest vitamin C sources. Rotate in romaine, cilantro, parsley, cucumber, zucchini, with small amounts of leafy greens like kale a few times a week. Introduce new items slowly.
Water, always. Fresh and clean, checked daily. A reliable bottle beats a bowl they’ll tip and soil.
Get those four right and the pellet choice becomes the low-stakes decision it actually is.
Related reading
- Best rabbit foods: the sister guide for the other hay-and-pellet herbivore, if you keep both.
- Best hamster food: recommended diets for another popular small pet with very different needs.
- Guinea pig cage accessories and enrichment: pair the right food with hay racks, chews and enrichment.
- Rabbit hay feeders and storage: keep timothy hay and pellets fresh with proper feeders and airtight storage.
- Small-pet feeding schedules and portion control: portion sizes so pellets stay a supplement, not the main meal.
- Small-pet dental care and health monitoring: how a high-fiber hay diet supports dental wear and what to watch for.
- Small-pet water bottles and hydration: constant fresh water alongside the diet with a reliable bottle.
FAQ
What is the best guinea pig food?
For a healthy adult, a plain timothy-hay-based pellet with stabilized vitamin C. Oxbow Essentials Adult is the pick most vets and owners settle on: timothy first, ~25% minimum fiber, ~12-14% protein, low calcium, no seeds or colored bits. Buy a small bag so the vitamin C stays fresh.
What is the best guinea pig food brand?
Oxbow, Kaytee and Small Pet Select are the three worth your time. Oxbow is the safe all-round choice. Kaytee Timothy Complete is the value pick you’ll find in any store. Small Pet Select is the premium, freshness-focused option. All use a timothy base plus vitamin C, so getting the right formula for your pig’s age matters more than the brand.
How much vitamin C do guinea pigs need?
About 10-30 mg a day, up to 30-50 mg for pregnant or nursing sows, since they can’t make their own. It comes from fortified pellets and fresh veg. But pellet vitamin C fades with heat, light and time and is usually only counted potent for about 90 days from the mill date, so check the bag date and lean on fresh bell peppers.
What is the best food for senior guinea pigs?
The same timothy-based adult pellet. The change with age is about weight, not the pellet. A senior losing weight can benefit from leafier 3rd-cut timothy hay, or vet-approved alfalfa on the side for calories. Don’t switch a healthy senior to a junior formula on your own, and treat unexplained weight loss as a vet visit.
What is the best high-protein guinea pig food?
High protein (~18%) is for pigs under 6 months and for pregnant or nursing sows, not healthy adults. The standard choice is an alfalfa-based junior formula like Oxbow Essentials Young. Feeding that to a normal adult long-term pushes calcium and calories too high, so move to the adult timothy formula around 6 months.
What is the best natural guinea pig food?
Natural should mean no artificial colors, flavors or preservatives and no seed, corn or fruit pieces, not a colorful gourmet mix. A garden-style line like Oxbow Garden Select fits, and a plain timothy pellet already meets the spirit of it. Avoid anything sold as “natural” that still has whole seeds or dyed shapes.
Can guinea pigs eat pellets only?
No. Pellets are a supplement, not the meal. Unlimited grass hay is about 80% of the diet and does the real work for digestion and teeth. Give roughly 1/8 cup pellets per adult per day, about 1 cup of fresh veg, and always water. Pellet-only leads to dental and gut trouble.
What vegetables are safe for guinea pigs?
Bell peppers (great for vitamin C), romaine, cilantro, parsley, cucumber and zucchini daily, with small amounts of broccoli or kale a few times a week. Avoid iceberg lettuce, potato, onion and garlic. Introduce new foods slowly and remove uneaten fresh veg after a few hours.
Bottom line
Pick a plain timothy-based pellet with vitamin C, buy it in a bag small enough to stay fresh, and then spend your real attention on hay and veg. Oxbow Essentials Adult is the pick I’d make for most people. Kaytee if you want to save a few dollars, Small Pet Select if you want the freshest bag. Whatever you choose, keep hay unlimited, pellets to about 1/8 cup a day, veg around a cup, and walk right past the pretty mixes with seeds and colored pieces. That last one is the difference that actually shows up in your pig’s health.