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Metamucil 4-in-1 Psyllium Fiber Supplement, Sugar-Free Orange Smooth Powder bottle
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Metamucil 4-in-1 Psyllium Fiber Supplement, Sugar-Free Orange Smooth Powder Review

Metamucil is a leading fiber supplement brand made with psyllium husk, a plant-based fiber that provides 4-in-1 health benefits. This sugar-free, orange-flavored smooth powder is designed to support digestive health, help lower cholesterol to promote heart health, maintain healthy blood sugar levels, and help you feel less hungry between meals.

Product Focus: Regularity: Long-Term ReliefAlso covers:Digestion
Tier ⓘ
Members
Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
Members
How strongly the evidence says this product works: human studies count most, then real reviews, then our biohacker panel.
Positive Reviews
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Biohacker Mentions
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Cost per month
$6
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Study, Trial or Testing Result Summary

MembersHuman studies

4 of these 83 human studies gave the ingredient by drip, not by mouth.

This powder gives 15 grams of soluble fiber a day, which is the 8 grams that in studies. human studies found soluble fiber with constipation. …

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Review Totals and Summary

Members8,674 reviews
8,674 reviews · Walmart 6,043 · Samsclub 2,611 · Fsastore 19 · Wegmans 1

Based on a number of user reviews across major retailers, people who tried Metamucil 4-in-1 Psyllium Fiber Supplement, Sugar-Free Orange Smooth Powder report generally experiences, especially when it comes to its effectiveness and of use. users highlight that this supplement them maintain regularity and supports digestive , with some describing a noticeable in comfort and overall gut function after incorporating it into their daily routine. …

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Biohacker Summary

MembersWhat our biohacker panel says

The panel said nothing about psyllium fiber, the main ingredient, so there is group view to report on it. Only two smaller ingredients in this product came up: potassium and iron. …

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RAL Summary

MembersThe tier and why

Soluble fiber is given at a dose, and a review of 12 trials in 1,405 people found it severe constipation by about 80 percent, with smaller trials and 93 percent of 8,674 reviews .

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More Details

MembersBody systems · Combine with · Possible side effects

Body systems: Digestive system. Combine with and possible side are for members.

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Supplement Facts

Soluble Fiber 5 g · Iron 0.7 mg · Potassium 60 mg
Supplement Facts
Serving Size 2 Rounded Teaspoons (11.6 g)
Servings Per Container About 90
Amount Per Serving% Daily Value
Calories30
Total Carbohydrate10 g4%
Dietary Fiber6 g21%
Soluble Fiber5 g
Iron0.7 mg4%
Sodium10 mg<1%
Potassium60 mg1%
* Percent Daily Values are based on a 2,000 calorie diet.

Directions: 1-2 rounded teaspoons in 8 oz of liquid, up to 3 times daily.

Label source: the brand's label · Report a label change

Where to Buy

Metamucil · Amazon · Walmart
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We sell no supplements. Prices change; check the store.

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Our articles on this subject

Graded October 23, 2026 by the Reverse Age Lab evidence engine, from human studies, real reviews and our biohacker panel. How we grade. Is this medical advice? No. Rala organizes the published evidence; go over any change with your doctor, especially if you take meds.