Boil broccoli until it's soft enough for a toddler and some of its vitamin C ends up in the pot water. That doesn't mean cooking is bad, just that a few small changes keep more of it on the plate.
Written by Vita Globe Editorial Team | Reviewed against NIH guidance and peer-reviewed food science research
Does cooking destroy vitamin C?
Partly. Vitamin C dissolves in water and breaks down with heat, so long cooking and prolonged storage lower it[1]. In a broccoli study, every method tested except steaming caused significant vitamin C losses, with steaming retaining the most[2]. The NIH notes steaming or microwaving may lessen losses[1].
Caveat: Losses vary by vegetable, cut size and time; cooked vegetables still count, and eating them matters more than perfect technique.
Sources: NIH ODS: Vitamin C · Yuan et al. 2009 · Verified 2026-09-28
In this article
Why is vitamin C so fragile?
Two properties: it’s water-soluble, so it leaches into cooking water, and it’s destroyed by heat[1]. Exposure to air and time in storage wear it down too. Food science reviews show vitamin C content depends on variety, ripeness, handling and especially storage time and temperature after harvest[4].
The flip side: many of the best vitamin C foods — citrus, berries, kiwi, peppers — are usually eaten raw[1], which is great news for kid-friendly snacks.
Which cooking methods keep the most vitamin C?
A study comparing five methods on broccoli — steaming, microwaving, boiling, stir-frying, and stir-frying then boiling — found that all of them except steaming caused significant losses of vitamin C, and concluded steaming was best for retaining nutrients[2].
| Method | Vitamin C retention |
|---|---|
| Raw | Highest |
| Steaming | Best of the cooked methods tested[2] |
| Microwaving (little water, short time) | May lessen losses vs boiling[1], though it still caused losses in the broccoli study[2] |
| Boiling, long simmering | More loss into water and from heat[1][2] |
Short cooking time and little water are the common thread.
Is frozen or canned produce lower in vitamin C?
Frozen can be surprisingly good. A review comparing fresh, frozen and canned produce found vitamin C losses during storage of fresh produce, while freezing retained vitamin C relatively well; canning’s heat step caused losses[3]. So a bag of frozen broccoli or berries can match or beat “fresh” produce that has sat in the fridge for a week. Canned produce still counts toward fruit and vegetable intake.
Easy ways to keep more vitamin C in kids' meals
- Serve some produce raw. Pepper strips, cherry tomatoes (halved or quartered for small kids), fruit.
- Steam, don’t boil. Steam broccoli or cauliflower until just tender[2].
- Use less water, less time. Microwave in a covered dish with a splash of water[1].
- Cut close to cooking. Chopped produce exposes more surface to air.
- Use the liquid. Soups and stews keep leached vitamin C in the bowl.
- Buy fresh often, or use frozen. Storage time wears vitamin C down[4][3].
- Add fruit at the end. Top pancakes or oatmeal with fruit after cooking.
For foods to start with, see vitamin C foods kids actually eat and foods high in vitamin C. Pair them with iron foods using these easy pairings.
The honest summary
- Heat, water and time reduce vitamin C.
- Steaming retained the most in research on broccoli; raw is best of all.
- Frozen produce holds vitamin C well; long-stored fresh loses some.
- Cooked vegetables still count — getting kids to eat them matters most.
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Frequently asked questions
Does microwaving vegetables destroy vitamin C?
It can cause some loss — in one broccoli study it did[2] — but with little water and a short time it is generally gentler than boiling, and the NIH notes steaming or microwaving may lessen losses[1]. Results vary by study and vegetable.
Does orange juice lose vitamin C once opened?
Vitamin C breaks down over time with air exposure, so an opened carton slowly loses some. Keep it cold and finish it within the date on the label.
Are frozen strawberries as healthy as fresh?
Often comparable for vitamin C, since freezing retains it relatively well[3].
Is steamed broccoli better than raw for kids?
Raw keeps the most vitamin C, but steamed is softer and easier for young children; steaming was the best cooked method in research[2].
Does baking potatoes keep vitamin C?
A baked medium potato still provides about 17 mg[1], a good chunk of a young child's need.
Sources
- Office of Dietary Supplements, National Institutes of Health. Vitamin C: Fact Sheet for Health Professionals. Updated July 31, 2025. ods.od.nih.gov
- Yuan GF, Sun B, Yuan J, Wang QM. Effects of different cooking methods on health-promoting compounds of broccoli. Journal of Zhejiang University SCIENCE B. 2009;10(8):580-588. doi:10.1631/jzus.B0920051
- Rickman JC, Barrett DM, Bruhn CM. Nutritional comparison of fresh, frozen and canned fruits and vegetables. Part 1. Vitamins C and B and phenolic compounds. Journal of the Science of Food and Agriculture. 2007;87(6):930-944. doi:10.1002/jsfa.2825
- Lee SK, Kader AA. Preharvest and postharvest factors influencing vitamin C content of horticultural crops. Postharvest Biology and Technology. 2000;20(3):207-220. doi:10.1016/S0925-5214(00)00133-2
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
