Orange pith, the spongy white layer between the peel and the fruit, is surprisingly nutritious. It concentrates more fiber, flavonoids, and vitamin C than the juice alone, and eating it is completely safe. Most people peel it off because of its mildly bitter taste, but that bitterness comes from the very compounds that make it beneficial.
What Makes Orange Pith Nutritious
The pith (technically called the albedo) is rich in two things most people don’t get enough of: dietary fiber and plant compounds called flavanones. Orange peel as a whole, which includes the pith, contains roughly 67% total dietary fiber by weight. That fiber is a mix of soluble fiber, primarily pectin, and insoluble fiber like cellulose and hemicellulose. Citrus juice without pulp contains very little fiber by comparison, so the pith and membranes are where nearly all of it lives.
The pith is also where the fruit stores most of its flavanones and other phenolic compounds. The outer colored layer of the peel is richer in carotenoids, but the white inner layer is the real source of hesperidin, the flavonoid most studied for cardiovascular benefits. Vitamin C levels in the peel are actually comparable to the fruit’s inner flesh. One analysis of oranges found 110 mg of vitamin C per 100 grams in the peel, compared to about 90 mg per 100 grams in the pulp and inner parts. So by discarding the pith, you’re leaving some vitamin C on the table.
Heart and Cholesterol Benefits
The pectin in orange pith has a well-documented effect on cholesterol. It forms a viscous gel during digestion that binds to bile acids, which forces your liver to pull cholesterol from the bloodstream to make more. In animal studies, pectin supplementation brought total cholesterol and LDL (“bad” cholesterol) levels down from high-fat-diet levels back to those of a normal control group. That’s a meaningful reduction, not just a marginal shift.
Hesperidin, the dominant flavonoid in the pith, adds a separate layer of cardiovascular protection. Higher intake of flavanones from citrus has been repeatedly linked to lower rates of death from cardiovascular disease. Preclinical research shows citrus flavanones slow the development of atherosclerosis, the buildup of plaque inside arteries, by influencing genes involved in vascular dysfunction. One interesting detail: your gut bacteria have to break hesperidin down before your body can absorb it, which means a healthy gut microbiome plays a role in how much benefit you actually get.
Blood Sugar and Insulin Effects
Pectin’s gel-forming ability does double duty. The same viscous gel that traps bile acids also traps carbohydrates during digestion, slowing their absorption and blunting the spike in blood sugar that follows a meal. It also appears to inhibit an enzyme that breaks down starch into sugar, further moderating the glycemic response. In animal studies, pectin supplementation partially reversed insulin resistance, bringing glucose tolerance test results and insulin resistance scores back toward normal levels. If you eat your orange with the pith intact rather than just drinking the juice, you’re getting a built-in mechanism to slow sugar absorption from the fruit itself.
Anti-Inflammatory and Gut Health Effects
Citrus flavonoids play established roles in controlling oxidative stress and inflammation. Regular orange juice consumption over several weeks has been shown to reduce C-reactive protein, a key marker of systemic inflammation, a finding confirmed through meta-analysis. The bioactive compounds responsible for this, including hesperidin and narirutin, are found in higher concentrations in the pith and membranes than in the juice alone.
There’s also a feedback loop with your gut. Your intestinal bacteria metabolize citrus flavonoids into smaller compounds that are easier for your body to absorb, and in return, those flavonoids appear to reshape the gut microbiome in beneficial ways. One study found that drinking 300 mL of orange juice daily for 60 days changed gut bacteria composition while simultaneously improving blood glucose and lipid profiles. Eating the pith gives you a more concentrated dose of these compounds than juice provides.
Safety is not a concern. Reviews of the research have found that even high-dose, long-term intake of citrus peels and their extracts produces no serious adverse effects in humans or animals.
Why It Tastes Bitter (and What to Do About It)
The bitterness of orange pith comes directly from its flavonoid content. You’re literally tasting the health benefits. The simplest approach is to just eat it along with the fruit. When you peel an orange by hand, leave the white layer on the segments rather than scraping it off. The sweetness of the fruit offsets the mild bitterness, and most people adjust to the taste quickly.
If you find the bitterness too strong on its own, blending whole orange segments (pith, membranes, and all) into smoothies works well because other ingredients mask the flavor. You can also add peeled orange segments with pith intact to salads, where dressing balances out the taste. Marmalade is another traditional use, since the cooking and sugar reduce bitterness considerably.
For the outer peel, which includes both the colored zest and the pith, culinary traditions like candying or drying for tea typically call for removing the pith to avoid bitterness. But if your goal is nutrition rather than flavor, keeping the pith is the whole point. The easiest strategy is simply to stop peeling it off your orange segments. You’re already eating the fruit. The pith is just the part you’ve been throwing away.