Psyllium Husk
A soluble fibre from the husks of Plantago ovata seeds. Expands into a thick gel when it contacts water in the stomach, which may slow digestion and increase feelings of fullness. The most affordable fibre supplement with mixed but potentially promising evidence when used specifically before meals in people with overweight or obesity.
Quick read · 3 min
- •Evidence: Moderate — some consistent evidence but with limitations
- •The evidence is mixed — two meta-analyses reach different conclusions.
- •Generally very safe.
- •Unlike prescription drugs, supplements are not tested for effectiveness by the FDA before sale
Based on clinical trials · No rankings · Every claim linked to source
Last reviewed: March 2026
How it works
Highly viscous soluble fibre that absorbs water and expands in the stomach, forming a gel. This slows gastric emptying (how quickly your stomach empties into the intestine), which may help you feel full sooner and for longer after meals. Often taken 10–15 minutes before eating to get maximum fullness effect before the meal begins.
What the evidence shows
The evidence is mixed — two meta-analyses reach different conclusions. A 2023 meta-analysis of 6 randomised controlled trials in overweight and obese adults found that psyllium taken before meals (about 10.8g/day for about 5 months) produced an average of 2.1 kg more weight loss than placebo, with reductions in BMI and waist circumference too. However, a broader 2020 meta-analysis of 22 randomised controlled trials in general adults found no statistically significant effect on weight (-0.28 kg, not significant). The positive findings come specifically from trials that dosed psyllium before meals and studied people who were already overweight — general use may show less benefit.
Safety
Generally very safe. Must always be taken with a full glass of water — taking it with too little liquid can cause it to swell in the throat and create a choking hazard. Expect some bloating and gas in the first week or two as your gut adjusts. This typically settles. Not suitable for people with swallowing difficulties or oesophageal narrowing.
Community insights
These are personal experiences shared in public online communities — not medical advice.
“Start with a small amount (half a teaspoon) and work up slowly. Going straight to a full dose causes significant bloating in most people.”
“Mix it and drink it quickly — it thickens into a gel fast and becomes much harder to drink if you leave it sitting.”
Common questions
After reading this page, most people compare this with other supplements, look at prescription options, or check what they can do today without a prescription.