Orange pith is the white, spongy layer between the outer colored skin and the juicy flesh of an orange. Botanically called the albedo, it’s the part most people peel off and throw away. But this tissue is surprisingly rich in fiber, plant compounds, and pectin, making it both more nutritious and more useful than it looks.
Where Pith Sits in the Orange
An orange peel has two distinct layers. The outer colored layer (the part you zest) is called the flavedo. Directly beneath it sits the pith, a thicker, pale, cottony tissue that wraps around the fruit segments. The pith also extends inward as the thin membranes separating each wedge, though those membranes are much thinner than the main layer just under the skin.
The pith’s biological job is structural: it cushions the fruit and acts as a transport layer between the outer rind and the developing segments inside. It’s composed mainly of three plant fibers: pectin, cellulose, and hemicellulose. That fiber-heavy composition is what gives it its dry, slightly papery texture compared to the juicy flesh underneath.
Why It Tastes Bitter
The pith’s bitterness comes primarily from two naturally occurring compounds: naringin and limonin. Naringin is a type of flavonoid concentrated in the white tissue. Limonin works differently. It starts as a non-bitter compound in the intact fruit, then converts to its bitter form when exposed to acidic conditions, like when you bite into a segment and the juice hits the pith.
The bitterness varies between citrus types. Navel oranges tend to have milder pith than grapefruits, where naringin levels are much higher. Even within oranges, thicker-skinned varieties generally have more pith and a more noticeable bitter edge. The compounds responsible for that bitterness, however, are the same ones that carry many of the pith’s health benefits.
Nutritional Value and Health Benefits
The pith is where oranges concentrate their flavonoids, particularly hesperidin. This compound has drawn considerable research attention for its effects on blood vessels and inflammation. Hesperidin helps blood vessels relax by boosting nitric oxide production, which is essential for maintaining healthy blood pressure. It also suppresses key inflammation signals in the body and reduces the stickiness of white blood cells to artery walls, an early step in plaque buildup.
In a randomized, placebo-controlled clinical trial, participants who took 450 mg of hesperidin daily for six weeks saw reductions in both systolic and diastolic blood pressure, along with decreases in markers of vascular inflammation. A separate 12-week trial found that a hesperidin-rich orange extract shifted gut bacteria profiles and reduced a marker of intestinal inflammation called fecal calprotectin. Hesperidin also appears to function as a prebiotic, feeding beneficial gut bacteria.
Beyond flavonoids, the pith’s high fiber content has its own effects. A study in healthy adults found that orange juice enriched with citrus fiber from the albedo (containing roughly 3.5 grams of total fiber per serving) lowered blood sugar and insulin levels in the 15 minutes after drinking, compared to regular juice. It also increased a gut hormone involved in satiety. This is a practical point: eating orange segments with some pith attached slows sugar absorption compared to drinking strained juice alone.
How Pith Is Used in Cooking and Industry
Most commercial pectin, the substance that makes jams and jellies set into a gel, comes from citrus pith. The albedo contains far more pectin than the colored outer rind. In the food industry, extracted pectin serves as a thickener, emulsifier, and stabilizer in products ranging from ice cream and salad dressings to bakery fillings and low-fat spreads. It’s also used as a fat replacer in processed meats.
In home kitchens, pith plays a role in marmalade, where thin-sliced rind (pith included) provides both texture and the natural pectin needed to gel the preserve. Candied citrus peel relies on the pith’s spongy structure to absorb sugar syrup. Some recipes for orange-based sauces and baked goods deliberately include small amounts of pith for body and a subtle bitter counterpoint to sweetness. If you’re making a recipe that calls for “supremed” citrus segments with all pith removed, that’s purely a texture and flavor choice, not a nutritional one.
Should You Eat It?
The pith is entirely safe to eat, and nutritionally it’s the most valuable part of the peel. The fiber is a mix of soluble and insoluble types (roughly 29% soluble, 42% insoluble in one analysis), which means it supports both blood sugar regulation and digestive regularity. The flavonoid content is substantially higher than what you get from the juice or flesh alone.
The simplest way to get more pith is to stop peeling it off so meticulously. When you peel an orange by hand, leaving the thin white layer on the segments gives you most of the benefit without much bitterness. The thicker pith directly under the skin is more bitter and chewy, which is why most people skip it. Blending whole peeled orange segments into smoothies is another easy way to include the pith and membranes without noticing the texture. For those who genuinely dislike the taste, even a small amount left on the fruit adds fiber that slows sugar absorption compared to eating perfectly cleaned segments.