Citrucel Review

Citrucel exists because Metamucil makes a lot of people gassy. That's the simplest, most honest framing of this product's purpose — and it fulfills that purpose well. We rate it 4.0 out of 5 because for the specific population of gas-sensitive users and IBS sufferers, Citrucel solves a problem that other fiber supplements create.

The key difference is one word: non-fermentable. Metamucil's psyllium fiber gets partially broken down by gut bacteria, and that bacterial feast produces gas — sometimes a lot of it, especially during the first couple of weeks. Citrucel's methylcellulose passes through your digestive system without feeding gut bacteria at all. Same bulking effect, same stool softening, dramatically less gas.

How Citrucel Works

Citrucel is a bulk-forming fiber supplement made from methylcellulose, a semi-synthetic fiber derived from plant cellulose. When you mix the powder with water and drink it, the methylcellulose absorbs water in your digestive tract, forming a soft, gel-like mass that adds bulk to your stool and makes it easier to pass.

The mechanism is identical in principle to what Metamucil does with psyllium — absorb water, form bulk, promote natural motility. The critical distinction is what happens at the bacterial level. Psyllium is a soluble, fermentable fiber, which means the trillions of bacteria in your large intestine can break it down and produce gas as a metabolic byproduct. Methylcellulose is also soluble, but it's non-fermentable — your gut bacteria lack the enzymes to break it down. The fiber does its mechanical job (absorbing water, adding bulk) and passes through intact.

This non-fermentable property is what makes Citrucel the preferred fiber supplement among gastroenterologists for patients with IBS, excessive gas, or bloating sensitivity. It delivers the structural benefit of fiber without the bacterial side effects.

The Texture and Taste Advantage

We tested Citrucel side by side with Metamucil, and the sensory difference is notable. Citrucel's powder dissolves more smoothly and completely than psyllium. Where Metamucil produces a thick, slightly gritty suspension that gels rapidly, Citrucel creates a cleaner, thinner mixture that stays drinkable for a longer window.

The orange flavor is milder and less artificial-tasting than Metamucil's strong orange. It reads more as lightly flavored water than the intensely sweet orange punch that Metamucil delivers. During our tasting sessions, the majority of testers preferred Citrucel's flavor profile — describing it as "subtle," "easy to drink," and "barely there in a good way." A few testers who specifically enjoy bold, sweet flavors preferred Metamucil, but they were the minority.

You still need to drink it relatively quickly after mixing — within a few minutes — but you have more grace time than Metamucil's 60-second window before gelling occurs. This might sound like a small detail, but anyone who has stared down a cup of solidifying orange Metamucil understands why an extra two minutes of drinkability matters.

The sugar-free version uses aspartame for sweetness, so people with phenylketonuria (PKU) should opt for the regular formula or the caplet form instead.

Who Citrucel Is Best For

Gas-sensitive users who gave up on other fiber supplements. If you tried Metamucil and the bloating drove you away, or if gas is already a daily problem you're trying to manage, Citrucel addresses the fiber need without amplifying the gas issue. This is its strongest differentiation and the primary reason we recommend it.

IBS sufferers, particularly IBS-C (constipation-predominant). IBS and gas exist in a frustrating feedback loop — constipation causes bloating, fermentable fiber relieves constipation but adds gas, and the gas worsens IBS symptoms. Citrucel breaks this cycle by providing the bulk benefit without the fermentation penalty. Several gastroenterology guidelines specifically mention methylcellulose as a preferred fiber type for IBS patients.

People who need daily fiber supplementation long-term. Citrucel is safe for indefinite daily use, and its gentler side effect profile makes long-term adherence more realistic than supplements that cause weeks of adjustment gas. If your doctor has recommended a daily fiber supplement and you're looking for one you'll actually stick with, Citrucel's tolerability is a genuine advantage.

What Citrucel Can't Do

Lower your cholesterol. This is the biggest capability gap compared to Metamucil. Psyllium fiber has an FDA-approved claim for reducing LDL cholesterol by 5-10% with daily use. Methylcellulose has no such evidence or approval. If cholesterol management is part of your fiber supplement goals, Metamucil is the clear choice despite the gas tradeoff.

Provide fast relief. Citrucel takes 12-72 hours to produce noticeable results, and the full benefit builds over 1-2 weeks of daily use. If you're constipated right now and need help before tomorrow, reach for an osmotic laxative like MiraLAX or Milk of Magnesia.

Match the depth of clinical evidence behind psyllium. Metamucil's psyllium has decades of clinical trials across constipation, cholesterol, blood sugar management, and cardiovascular outcomes. Methylcellulose has solid evidence for constipation relief, but the research portfolio is thinner overall. For straightforward constipation prevention, this gap doesn't matter much. For people who want the most evidence-backed fiber supplement available, psyllium still leads.

Side Effects and Practical Considerations

The most important rule with Citrucel is the same as any fiber supplement: drink plenty of water. Methylcellulose absorbs water to function, and without adequate hydration, the fiber mass can become dry and compacted, potentially making constipation worse rather than better. We recommend at least one full glass of water with your dose and 6-8 glasses throughout the day.

Mild bloating can still occur during the first few days, even though gas production is dramatically lower than psyllium. Your digestive system needs time to adjust to increased fiber volume. Starting with half a dose for the first week minimizes this adjustment period.

The caplet form is an option for people who dislike powder mixing entirely, but it requires taking 4-6 caplets per dose — a noticeable handful. The powder is more cost-effective and delivers fiber more efficiently, but the caplets eliminate the taste and texture factor entirely.

How We Rated It

Citrucel earns 4.0 out of 5. It scores highest on tolerability — the low-gas profile is a genuine differentiator that makes daily adherence realistic for people who can't tolerate other fiber supplements. It matches Metamucil on constipation prevention effectiveness but loses a point for the absence of cholesterol-lowering evidence and the thinner clinical research base overall. For gas-sensitive users and IBS sufferers who need daily fiber, Citrucel is the fiber supplement we recommend first.