Collard Green
Juice

One pound of collard greens (approximately 454g) yields roughly 230–270ml in a masticating juicer — about 8–9 oz, just under a standard glass. A centrifugal juicer extracts significantly less: typically 135–205ml from the same pound, which can mean less than a standard cup.

The gap is wider for collard greens than for root vegetables because the large flat leaves are difficult for centrifugal blades to extract efficiently. If yield matters to your budget or protocol volume, a slow juicer makes a substantial difference here.

A typical large collard green leaf weighs 35–55g including the stem, or about 25–40g leaf-only. For 8 oz (240ml) of juice from a masticating juicer, you'll need roughly 8–12 large leaves (400–480g total).

Centrifugal juicers need more: plan on 14–18 large leaves for the same cup. Leaf size varies considerably — farmers market collards tend to run larger than supermarket bunches. Measuring by weight (400–500g per 8 oz serving) is more reliable than counting leaves.

A standard grocery store bunch of collard greens typically weighs 350–500g. In a masticating juicer, that yields approximately 175–300ml — roughly 6–10 oz, depending on bunch weight and freshness.

If you're buying collards specifically to juice, one bunch generally produces one small-to-medium glass. For a full 8–12 oz serving, plan on one large or two smaller bunches. For a week of daily 8 oz servings, you'll need 7–9 standard bunches from a masticating juicer.

Five pounds of collard greens (2,268g) yields approximately 38–46 oz (1,125–1,360ml) in a masticating juicer, or roughly 21–30 oz in a centrifugal juicer.

At 8 oz per day, a 5 lb batch covers about 4–5 days in a masticating juicer — and only 2–3 days in a centrifugal, which makes the extraction difference quite tangible when buying in volume. Use the calculator to work out your specific quantity by juicer type.

Freshness is the primary variable. Collard greens lose water quickly after harvest — wilted leaves can yield 20–30% less than fresh ones. Buy them as close to juicing day as possible, store unwashed in a sealed bag in the coldest part of the fridge, and use within 2–3 days.

Technique compounds this: collard greens juice far better when rolled tightly (like a cigar) or alternated with high-water produce like cucumber or celery through the feed chute. Feeding flat loose leaves through a centrifugal juicer almost guarantees poor extraction. Stem content also matters — removing the thick central rib and juicing leaves only improves yield in most juicers, particularly masticating models.

Yes, in two ways. First, yield: a masticating or twin gear juicer extracts 50–70% of the liquid, concentrating nutrients into a smaller volume. A centrifugal juicer extracts 30–45%, producing a more dilute juice with fewer total nutrients per cup.

Second, oxidation: centrifugal juicers introduce air through high-speed spinning, degrading heat-sensitive compounds like vitamin C and chlorophyll during extraction. Research on comparable leafy greens (kale, spinach) shows vitamin C retention of 80–95% in masticating juicers versus 70–85% in centrifugal. For collard greens specifically, the fat-soluble nutrients — vitamin K, beta-carotene — concentrate with yield and are largely unaffected by oxidation; the water-soluble vitamin C is where you'll see the difference.

This is the most important safety note for collard green juice. A 100ml serving contains approximately 795mcg of vitamin K — over 660% of the daily adequate intake. Vitamin K directly regulates blood clotting, and high, variable intake can interfere with warfarin (Coumadin) and other vitamin K antagonist anticoagulants.

If you take blood thinners, the guidance is consistency rather than elimination: your clinician will typically advise maintaining stable vitamin K intake day to day so your dosing remains predictable. A small, fixed daily amount of collard green juice is safer than large irregular quantities. Always consult your prescribing physician before adding collard green juice to a regular routine if you're anticoagulated.

Exceptionally so. Collard green juice provides approximately 422mg of calcium per 100ml — roughly the same as a glass of cow's milk, in plant form. Collard greens are one of the highest-calcium plant foods available, and juicing concentrates that calcium further by removing water while retaining minerals.

The calcium in collard greens is also reasonably bioavailable for a leafy green. Unlike spinach, which contains high oxalate levels that bind calcium and inhibit absorption, collard greens have low oxalate content — making their calcium more accessible. This makes collard green juice particularly relevant for people seeking dairy-free calcium sources.

Pure collard green juice is earthy, mildly bitter, and slightly grassy — similar to kale juice but generally considered milder and less assertively bitter. The large flat leaves produce a dark green juice with a smooth texture.

It blends well with citrus (lemon or grapefruit cut the bitterness cleanly), celery juice (neutral and diluting), apple or pear (for sweetness), and ginger (which adds warmth and masks the earthy notes). Parsley juice complements collard greens with a similar herbal depth. A practical starting blend: 250g collard greens, 200g cucumber, 1 lemon (peeled), and a thumb of ginger — produces about 12–14 oz of palatable green juice.

For most juicers, yes — removing the thick central rib improves yield and reduces strain on the machine. The stems are predominantly fiber and cellulose; they contain water but extract poorly even in slow juicers, and their bulk can clog masticating augers.

Younger, thinner stems from smaller leaves can generally be juiced without issue. For the large, mature collard leaves most commonly sold in grocery stores, strip the leaf from the central rib, roll the leaves tightly, and feed them in. No peeling is needed — the leaf surface is where chlorophyll, vitamin K, and beta-carotene are concentrated.

Masticating or twin gear collard green juice keeps 48–72 hours in a sealed glass jar filled as full as possible to minimize air contact. Store at the back of the fridge where temperature is most stable; chlorophyll-rich green juices degrade faster near the door.

Centrifugal collard green juice should be consumed within 24 hours — the oxidation introduced during high-speed extraction accelerates nutrient loss in storage. For batch juicing more than a day ahead, a slow juicer is the practical choice.