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Citrucel Sunmark Fiber Therapy Methylcellulose 500mg bottle
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Citrucel Sunmark Fiber Therapy Methylcellulose 500mg Review

Sunmark Fiber Therapy Methylcellulose 500mg is a bulk-forming fiber laxative designed to relieve occasional constipation and help restore and maintain regularity.

Product Focus: Regularity: Long-Term ReliefAlso covers:Digestion
Tier ⓘ
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Members see this product's tier and why. Tiers run from 1, the strongest evidence, to 5. How we grade →
Evidence ⓘ
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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
$10
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Study, Trial or Testing Result Summary

MembersHuman studies

The main ingredient, methylcellulose, is a bulk-forming fiber at 500 milligrams per serving, but study findings for methylcellulose were provided here, so we cannot summarize research on it. The only ingredient with study findings is calcium, and this product has just 10 milligrams per serving, far the 500 to 1200 milligrams a day used in the studies. …

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Review Totals and Summary

Members225 reviews
225 reviews · Walgreens 220 · Amazon 5

Sunmark Fiber Therapy Methylcellulose 500mg receives a largely response from users who comment on its effectiveness for managing regularity and digestive support. reviewers, especially those posting on Walgreens, mention that the product reliably and maintain a regular bowel routine, making it a staple in their daily regimen. …

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Biohacker Summary

MembersWhat our biohacker panel says

The panel is split on calcium, the main ingredient, and leans toward getting it from food rather than pills. others stay and point to sardines, dairy, kale and leafy greens, and one takes a calcium and magnesium pill, while another uses calcium citrate with a oxalate meal. …

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RAL Summary

MembersThe tier and why

This product is placed in the reviews tier because of its 225 reviews are ; the study evidence provided covers only calcium, which is present at a tiny dose and did constipation in the largest trials.

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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

Methylcellulose 500 mg · calcium 10 mg
Supplement Facts
Serving Size 1 caplet
Servings Per Container 100
Amount Per Serving% Daily Value
Methylcellulose (a non-allergenic fiber)500 mg†
calcium10 mg
† Daily Value not established.

Other ingredients: Crospovidone, dibasic calcium phosphate, FD&C yellow no. 6 aluminum lake, magnesium stearate, maltodextrin, povidone, sodium lauryl sulfate.

Directions: Take this product (child or adult dose) with at least 8 ounces (a full glass) of water or other fluid. Taking this product without enough liquid may cause choking. See choking warning. Age Dose Maximum Dose adults & children 12 years of age and over start with 2 caplets. Increase as needed up to 6 times per day. do not exceed 12 caplets per day children 6-11 years of age start with 1 caplet. Increase as needed up to 6 times per day. do not exceed 6 caplets per day children under 6 years of age consult a physician consult a physician

Label source: Mountainside-medical · Report a label change

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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.