Yes. Guinea pigs cannot synthesize their own vitamin C and must receive it daily through fresh foods and, in many cases, a veterinarian-approved supplement or properly formulated pellets labeled for guinea pigs. Deficiency leads to scurvy, which causes joint pain, limping, rough coat, bleeding gums, and delayed wound healing.

Pellets marketed for guinea pigs are often fortified, but vitamin C degrades over time, especially when exposed to heat, moisture, or long storage. Buying fresh bags in reasonable quantities and storing them in a cool, dry place helps. Do not rely on rabbit pellets for guinea pigs; their needs differ.

Fresh vegetables high in vitamin C, such as bell pepper, small amounts of parsley, and occasional strawberry tops, can contribute, but portions must stay within overall calorie and calcium guidelines your vet sets. Citrus is not required and may upset some stomachs.

Water-soluble vitamin C drops can oxidize quickly in water bottles, losing potency and encouraging bacterial growth if bottles are not cleaned daily. Many owners prefer tablets or supplements given directly, but follow professional dosing rather than guessing.

If your guinea pig is suddenly reluctant to move, cries when picked up, has swollen feet, or stops eating, seek same-day veterinary care. Scurvy and other painful conditions overlap with injuries and urinary problems, all of which need diagnosis.

Pair nutrition with hay, space, and companionship where appropriate. Healthy guinea pigs still need daily vitamin C for their entire lives, not just as babies.