Nearly every vegetable can be juiced, from common staples like carrots and celery to leafy greens like spinach and kale. The real differences come down to how much liquid each vegetable produces, what nutrients it delivers, and whether any parts need to be removed before they go into the juicer. Some vegetables are juicing workhorses that yield a full glass on their own, while others work better as flavor or nutrition boosters mixed into a base.
High-Yield Vegetables That Form a Good Base
If you want a full glass of juice without running pounds of produce through your machine, start with vegetables that are naturally water-rich. Cucumbers sit at the top of the yield scale, producing more liquid per pound than almost any other vegetable. Celery is close behind, and its mild, slightly salty flavor makes it a popular base for green juices. Tomatoes also juice easily and give you a savory, slightly acidic foundation to build on.
Carrots are one of the most popular juicing vegetables despite being denser than cucumbers or celery. They produce a sweet, smooth juice that pairs well with almost anything. Zucchini and other summer squash are another high-water option, though their flavor is quite neutral. As a general rule, you can expect roughly 10 to 12 fluid ounces of juice per pound of prepared produce, but watery vegetables like cucumbers will exceed that while dense root vegetables fall below it.
Leafy Greens as Nutrition Boosters
Kale, spinach, Swiss chard, romaine lettuce, and parsley are all popular juicing greens, but they produce very little liquid on their own. Think of them as nutrition add-ins rather than a juice base. A handful of kale or spinach blended into a cucumber or celery base adds vitamins, minerals, and chlorophyll, the pigment that gives greens their color, without killing your yield.
Chlorophyll and its derivatives have shown antioxidant and anti-inflammatory properties in lab studies, and supplements containing these compounds have been used safely for decades. That said, robust human clinical trials confirming specific health benefits are still limited. The practical takeaway: green juice delivers real vitamins and minerals, but the more dramatic health claims you see online about chlorophyll are ahead of the science.
Root Vegetables and Beets
Beets deserve special mention. Beetroot juice is one of the most studied vegetable juices in nutrition research. The nitrates naturally present in beets get converted in your body, first by bacteria in your saliva and then by the acidic environment of your stomach, into nitric oxide. Nitric oxide relaxes blood vessel walls, which is why multiple systematic reviews have found that beetroot juice can measurably lower blood pressure. This effect has been demonstrated across different populations, making beet juice one of the few vegetable juices with a well-documented cardiovascular benefit.
Other root vegetables like sweet potatoes, parsnips, and turnips can technically be juiced, but they’re dense and starchy, producing minimal liquid. You’ll burn through a lot of produce for very little juice. Carrots and beets are the root vegetables best suited to juicing.
Cruciferous Vegetables
Broccoli, cabbage, cauliflower, and Brussels sprouts can all go through a juicer. They tend to produce a strong, somewhat bitter or sulfurous flavor, so most people use them in small amounts mixed with sweeter or milder bases like carrot or apple. Red cabbage juice has a striking purple color and a milder taste than green cabbage.
One thing to be aware of: cruciferous vegetables contain compounds called glucosinolates that can interfere with iodine uptake by the thyroid. In animal studies, these compounds break down into metabolites that inhibit thyroid hormone production. A small human study found that drinking kale juice twice daily for seven days reduced iodine uptake by 25%, though thyroid hormone levels in the blood stayed normal over that short period. There’s no established safe upper limit for cruciferous vegetable intake, but if you have a thyroid condition, it’s worth being thoughtful about how much raw cruciferous juice you’re drinking regularly.
Celery Juice and Its Compounds
Celery juice became a wellness trend in its own right, and while the most extreme claims about it are overblown, the vegetable does contain interesting bioactive compounds. Celery is rich in flavonoids, which act as antioxidants and have anti-inflammatory effects. It also contains a class of compounds called phthalides, which have been linked to blood pressure regulation and protection against atherosclerosis in laboratory research. These properties are real, but they’ve mostly been studied in isolated compounds or animal models, not in people drinking celery juice at breakfast.
Vegetables and Parts to Avoid
Most vegetables are safe to juice, but a few specific plant parts should stay out of your machine:
- Rhubarb leaves contain high levels of oxalic acid and are genuinely toxic. Only the stalks are safe.
- Carrot tops (the green leafy part) are also toxic and should be trimmed off before juicing.
- Citrus peels from oranges, grapefruit, tangerines, and tangelos contain compounds that can cause significant stomach upset.
Raw rhubarb stalks themselves are extremely high in oxalates at around 1,235 mg per 100 grams of fresh weight. Swiss chard ranges from 874 to 1,458 mg, and spinach can reach as high as 2,350 mg per 100 grams. Oxalates bind to calcium in the kidneys and can form calcium oxalate crystals, the most common type of kidney stone. If you have a history of kidney stones, heavy daily juicing of spinach, Swiss chard, or beet greens is worth reconsidering. Occasional use in moderate amounts is a different story than drinking a spinach-heavy juice every morning.
What Juicing Does to Nutrients
Juicing removes most of the fiber from vegetables. Fiber slows sugar absorption, feeds gut bacteria, and helps you feel full, so losing it is a genuine nutritional tradeoff. The sugars that were locked inside the plant’s cell walls become free sugars in juice, which your body absorbs more quickly.
Vitamin C is the nutrient most vulnerable to juicing and storage. When researchers tracked vitamin C levels in fresh-pressed vegetable juices stored in the refrigerator, they found that tomato juice lost up to about 7% of its vitamin C in the first week when kept in glass containers at refrigerator temperature. Carrot juice degraded faster, losing between 8% and 40% over seven days under the same conditions. Cucumber juice held up better, losing only about 10% in a week and 15% after three weeks. Room temperature storage accelerated losses dramatically: tomato juice kept at room temperature in glass lost nearly 30% of its vitamin C in just one week.
The practical lesson is straightforward. Drink fresh juice soon after making it, store it in glass rather than plastic, and keep it refrigerated. Within 24 hours, vitamin C losses at refrigerator temperature are minimal, typically under 2 to 6% depending on the vegetable. After 48 hours, losses climb to roughly 2 to 15%. By day three, you could be losing up to 20% of the original vitamin C content.
Whole vegetables do retain more of their antioxidant compounds than their juiced counterparts. But juice still delivers meaningful amounts of vitamins, minerals, and beneficial plant compounds. It’s a convenient way to increase your vegetable intake, not a replacement for eating whole vegetables.
Quick Reference by Category
- Best base vegetables (high yield, mild flavor): cucumber, celery, zucchini, tomato, romaine lettuce
- Sweet and flavorful: carrots, beets, bell peppers, sweet potato (low yield)
- Nutrient-dense add-ins (low yield): kale, spinach, parsley, Swiss chard, wheatgrass
- Strong-flavored (use sparingly): broccoli, cabbage, radish, ginger, garlic
- High oxalate (limit if prone to kidney stones): spinach, Swiss chard, beet greens, rhubarb stalks