Unlike guinea pigs, rabbits can synthesize their own vitamin C in the liver, so it is not a dietary essential in the strict sense. However, dietary vitamin C from fresh greens provides additional antioxidant protection, supports collagen synthesis for healthy skin and connective tissue, enhances iron absorption from plant foods, and can boost immune function during periods of stress or illness. Stressed, elderly, or ill rabbits may benefit from the extra vitamin C that comes with a generous daily portion of fresh vegetables.
A quarter of a bell pepper (about 30g) provides roughly 38mg of vitamin C — while your rabbit produces its own supply, the additional vitamin C from a daily serving of fresh greens and vegetables provides a helpful antioxidant boost, particularly for senior rabbits or those recovering from illness.
0.04% of daily nutrient intake
Vitamin C makes up 0.04% of your domestic rabbit's total daily nutritional requirements by weight. That's a tiny amount — but it matters.
True deficiency is very rare in rabbits because they produce their own vitamin C. However, during severe illness, prolonged stress, or liver disease, a rabbit's ability to synthesize vitamin C may be compromised, potentially leading to weakened immunity and slower healing.
Excess vitamin C is water-soluble and readily excreted in urine. It is not a practical concern from dietary sources.
| Life Stage | Size | Min | Max | Unit | Notes |
|---|---|---|---|---|---|
| Adult | — | 0 | 50 | mg | Rabbits synthesize their own vitamin C. No strict dietary requirement, but supplemental amounts from fresh greens are beneficial. |
Source: general veterinary consensus
Vitamin C significantly enhances the absorption of non-heme (plant-based) iron. Since rabbits are strict herbivores and only consume non-heme iron, this synergy is particularly valuable for maintaining healthy iron levels.
What this means: Feeding iron-rich greens like parsley and dandelion alongside vitamin C-rich foods like bell peppers naturally boosts iron absorption. Rabbits also produce their own vitamin C, adding to this benefit.
Vitamin C regenerates vitamin E after it has neutralized a free radical, effectively recycling this fat-soluble antioxidant. This regenerative cycle means both vitamins work more effectively together than either does alone.
What this means: Feeding a variety of fresh greens naturally provides both vitamins together. The vitamin C your rabbit synthesizes internally also contributes to this beneficial cycle.
