How Much Prune Is in SynoGut Compared With the Prune Studies?
Written by the Synogut editorial team · Medically reviewed by Dr. Will Bulsiewicz, MD, Physician
Last updated · Review date: October 16, 2026 · Who reviewed this page · How we write and review
SynoGut names prune as one of six ingredients but publishes no amount. The prune trials fed adults 80 to 120 grams of whole prunes a day, or enough for about 6 grams of fiber. A capsule holds under 1 gram of dense powder, so the research does not carry over. The fruit is the better match.
Key facts
- Prune is named on the SynoGut bottle art as dried plum, with fiber and sorbitol. The amount is not stated.
- A 4-week trial in 120 healthy adults used 80 or 120 grams of whole prunes a day.
- A 3-week crossover trial in 40 adults compared prunes with psyllium at about 6 grams of fiber a day each.
- That second trial was funded by the California Dried Plum Board.
- In both trials gas or fading benefits were part of the picture: more gas with prunes, and gains that faded after stopping.
- A large capsule holds under 1 gram of dense powder, so a capsule share of prune is tiny next to the studies.
What is the prune in SynoGut?
The bottle art lists prune as the dried plum, Prunus domestica, and notes that it brings fiber and sorbitol. Sorbitol is a sugar alcohol found naturally in the fruit.
Most people know prunes as a food for regularity. The idea is old and plain. A handful of dried fruit has fiber and sorbitol, and both can affect stool.
What the label does not say is the form. We cannot tell whether the capsule holds prune powder, prune fiber or an extract. Nor can we say how much. The amount is marked Not stated, like all six.
What did the larger prune trial use?
A randomized trial in 120 healthy adults gave them 80 or 120 grams of whole prunes a day for 4 weeks. A comparison group drank water (Lever et al., 2019).
The prune groups passed heavier stools than the water group. They also reported more gas. The trial measured stool output, gut transit time and the make-up of gut bacteria, and it ran on whole fruit eaten in tens of grams.
To put 80 to 120 grams in daily terms, think of a generous handful or more, every day, for a month. That is a food habit, not a pill.
What did the trial that put prunes against psyllium find?
A smaller crossover trial had 40 adults with constipation try prunes and psyllium in turn. Each treatment lasted 3 weeks and gave about 6 grams of fiber a day (Attaluri et al., 2011).
Prunes did a little better. They raised the number of complete bowel movements slightly more than psyllium did. The benefits of both faded once people stopped.
| Trial | People | Length | Prune amount | What it found |
|---|---|---|---|---|
| Lever et al., 2019 | 120 healthy adults | 4 weeks | 80 or 120 g of whole prunes a day | Heavier stools than water alone; more gas |
| Attaluri et al., 2011 | 40 adults, crossover | 3 weeks each | About 6 g of fiber a day from prunes | Slightly better than psyllium; gains faded after stopping |
How does a capsule compare with a handful of prunes?
The comparison is lopsided. A large size 00 capsule holds under 1 gram of a dense powder (UNC Pharmlabs). Two capsules a day likely hold about 1 to 2 grams of all six ingredients combined, our estimate from capsule size.
The trials used tens of grams of fruit. Even if every gram in a SynoGut serving were prune, which it cannot be, that would be a small slice of one handful. Prune is only one of six names sharing the space.
- The trials used whole fruit, not powder.
- The trials used tens of grams a day.
- A SynoGut serving likely holds 1 to 2 grams of everything together.
- The SynoGut prune amount is not published.
None of that means the capsule does nothing. It means the prune research cannot be used to predict what the capsule does. No study of the finished formula exists.
Does the sorbitol in prunes matter?
It may explain part of the fruit's effect. Prunes carry fiber and sorbitol, and the sources note that sorbitol may account for some of what the fruit does in the gut.
The prune trial recorded more gas than water. Our sources do not say how much of that came from sorbitol and how much from fiber. For anyone who gets gassy easily, it is worth knowing before you start.
The sources we hold give no sorbitol figure for the capsule. So we cannot say whether the capsule carries any meaningful amount.
Is it better to eat prunes than to take them in a capsule?
For matching the research, yes. Whole prunes at the trial amounts are the closer match, and food brings fluid and other nutrients with it. A handful of prunes also lets you see and control how much you take.
That said, prunes are not for everyone. Some people dislike them, and the trial saw more gas on prunes. A fiber-rich diet can include many other foods: fruit, vegetables, beans and whole grains.
Adults are advised to eat about 22 to 34 grams of fiber a day, added slowly with plenty of liquids (NIDDK, 2018 (diet)). Prunes can be one part of that, and a capsule adds a small extra.
| Fact | What is published |
|---|---|
| Serving | Follow your back label. Sixty capsules over 30 days works out to 2 capsules a day |
| Ingredient amounts | Not published |
| Packs and prices | 2 bottles at $79 each, 3 at $69 each, 6 at $49 each on the sales page. No 1-bottle pack |
| Guarantee | 60-day money-back. Claim by phone with your order ID. The buyer pays tracked return postage |
What happens when you stop eating prunes or taking fiber?
In the prune and psyllium trial, the gains faded after people stopped. That fits how fiber works. It acts while it passes through the gut, so it needs steady intake.
Nobody has studied what happens when you stop SynoGut. The only clue is the trial above. If you try the capsule, a weekly log of comfort and regularity helps you see what changes, and what changes back.
When should you see a doctor instead of reaching for prunes or a capsule?
See a doctor for blood in the stool, black stool, constant belly pain, vomiting, fever or weight loss without trying (NIDDK, 2018 (symptoms)). A lasting change in bowel habits belongs on that list too.
Adults aged 45 to 75 should have colorectal cancer screening, however regular they feel (USPSTF, 2021). A food or a supplement does not replace that.
SynoGut is a dietary supplement. It is not a treatment for constipation, IBS or any bowel disease, and it is not FDA approved, as no supplement is.
Frequently asked questions
Short answers on prunes and SynoGut, from the two trials named on this page.
How much prune is in SynoGut?
That is not published. The bottle art names prune and states no amount, and no Supplement Facts panel was supplied to us.
How many prunes did the studies use?
A 4-week trial gave adults 80 or 120 grams of whole prunes a day. A smaller trial used enough prunes for about 6 grams of fiber a day, for 3 weeks.
Do prunes work better than psyllium?
In one small crossover trial of 40 adults, prunes did slightly better at the same fiber dose. A prune growers' board paid for that trial, and the gains faded after stopping.
Can a capsule hold the same prune amount as the studies?
No. A large capsule holds under 1 gram of dense powder, while the studies used tens of grams of whole fruit.
Do prunes cause gas?
They can. Adults eating 80 to 120 grams a day reported more gas than those drinking water, so add them slowly with plenty of fluid.
Should I eat prunes instead of taking SynoGut?
Prunes match the research better, but the choice is yours. Talk to your doctor if you have a lasting bowel change, and food comes first either way.
Our view
The prune research is real, but it is about the fruit. Tens of grams of whole prunes a day for weeks is a very different thing from a capsule with an unstated share of prune.
If prunes appeal to you, eat them. They are a plain food with trial data behind them. If you want a capsule routine on top, treat SynoGut as a small extra, and ask your doctor first if you take medicines.
SynoGut is not a drug and not a cure. It is not FDA approved, and no study has tested the finished formula.
Last updated November 4, 2026.
