At a glance
Benefiber and Metamucil are two of the most commonly discussed fibre supplements. They work differently, and for people managing colorectal conditions, these differences matter. This guide compares them so you can make an informed choice.
The key difference
Metamucil is based on psyllium husk — a soluble fibre that absorbs water and forms a gel. This gel-forming property is what makes stools soft and easy to pass.
Benefiber is based on wheat dextrin — a soluble fibre that dissolves in water but does not form a gel in the same way. It adds bulk to stools but with a different mechanism.
For most people managing colorectal conditions, the gel-forming property of psyllium (Metamucil) is the more useful characteristic.
Comparison
| Feature | Metamucil (psyllium) | Benefiber (wheat dextrin) |
|---|---|---|
| Fibre type | Soluble (gel-forming) | Soluble (non-gel) |
| Stool softening | Strong | Moderate |
| Bulk adding | Yes | Yes |
| Taste/texture | Thicker, gritty (unflavoured) | Dissolves clear, minimal taste |
| Mixability | Needs stirring, can thicken | Dissolves easily |
| Gas/bloating | Moderate (especially early) | Generally less |
| Gluten | Gluten-free | May contain gluten traces |
| Water requirement | High — must drink plenty | Moderate |
What people report
Metamucil (psyllium)
- Described as the more effective stool softener by most people with colorectal conditions
- The texture can be off-putting — thickens quickly if not drunk immediately
- Works best when taken with a full glass of water and followed by additional water throughout the day
- Can cause bloating and gas initially — this typically settles within a week or two
- Available in powder, capsule, and wafer forms
Benefiber (wheat dextrin)
- Dissolves completely and is virtually tasteless — easier to incorporate into drinks and food
- Less effective at stool softening than psyllium for most people
- May cause less bloating and gas
- Can be mixed into foods — soups, yoghurt, beverages — without altering taste or texture
- Better tolerated by people who find psyllium’s texture unpalatable
Which to choose
For colorectal conditions where soft stools are critical (fissures, hemorrhoids, post-surgical recovery):
Psyllium-based products (Metamucil, Fybogel) are generally preferred because their gel-forming action directly softens stools.
For general bowel regularity with minimal disruption:
Benefiber may be more convenient due to its neutral taste and easy mixing.
For people who cannot tolerate psyllium’s texture:
Benefiber or psyllium in capsule form may be more practical alternatives.
Important notes
- Water intake matters enormously. Both supplements need adequate water. Fibre without water can worsen constipation rather than improve it.
- Start gradually. Both can cause bloating and gas initially. Start with half the recommended dose and increase over one to two weeks.
- These are supplements, not replacements. Dietary fibre from food remains the foundation. Supplements fill gaps.
- Speak to your pharmacist if you are unsure which product is available in your area or which is right for your situation.