Konsyl Daily Psyllium is my pick for most people on keto. A scoop supplies 5g fiber with 5g total carbs, leaving 0g net by subtraction. Its only ingredient is powdered psyllium husks. No sweetener, no maltodextrin, no arithmetic gymnastics.
Net carbs here mean total carbs minus dietary fiber. None of these picks lists erythritol, allulose or xylitol, so there’s no sweetener subtraction to do. Choose between plain psyllium, acacia and capsules by the format you want and the fiber per serving. Check your package for the latest amounts, liquid requirements and starting directions.
Compare the label servings
| Product | Serving | Total carbs | Fiber | Net carbs |
|---|---|---|---|---|
| Konsyl Daily Psyllium | 1 scoop (6g) | 5g | 5g | 0g |
| NOW Psyllium Husk Powder | 1 level tbsp (9g) | 8g | 7g | 1g |
| Viva Naturals Organic Psyllium | 1 tsp (5g) | 4g | 4g | 0g |
| Heather’s Tummy Fiber Acacia | About 1 level tsp (2.5g) | 2g | 2g | 0g |
| NOW Glucomannan | 3 veg capsules | 2g | 2g | 0g |
These aren’t equal-sized doses. NOW’s tablespoon gives the most fiber per listed serving, but it’s also the largest powder serving by weight here. Don’t mistake the comparison table for instructions to start at the full amount.
Konsyl Daily Psyllium: best overall
The Konsyl back-of-pack label lists 5g total carbs and 5g fiber per 6g scoop. Powdered psyllium husks are the whole ingredient list. That’s why I’d start here if the priority is an unsweetened psyllium with straightforward carb accounting.
To avoid choking, follow Konsyl’s directions to mix it with at least 8 oz of liquid and drink additional fluid afterward. It’s a powder to prepare each time, so I’d choose the capsule option below if mixing a glass is the part you’ll keep putting off.
NOW Psyllium Husk Powder: most fiber per listed serving
NOW’s panel gives 8g total carbs and 7g fiber per level tablespoon weighing 9g. That leaves 1g net. Psyllium seed husk is the only ingredient, with no sweetener or maltodextrin listed.
NOW says this powder isn’t instantized and isn’t expected to dissolve. Its directions are to mix vigorously into at least 12 oz of water or juice, consume immediately and drink more fluids during the day. I’d choose it for the larger fiber serving, rather than expecting a clear drink from plain husk powder.
Viva Naturals Organic Psyllium: organic psyllium pick
The Viva Naturals label prints 4g total carbs and 4g fiber per teaspoon weighing 5g. Net carbs calculate to 0g. The single ingredient is organic psyllium husk.
I’d choose Viva when organic psyllium is the priority. Directions say to mix into at least 8 oz of liquid and drink immediately. The teaspoon serving is smaller by weight than Konsyl’s scoop and NOW’s tablespoon, which matters when comparing how much fiber each serving supplies.
Heather’s Tummy Fiber Acacia: acacia alternative
Heather’s brand panel lists 2g total carbs and 2g fiber per 2.5g serving, about a level teaspoon. Its only ingredient is organic acacia senegal powder. That’s 0g net by the same subtraction used for the psyllium picks.
It’s sold as a medical food for IBS and should be used under a physician’s supervision. The page says to start with half a level teaspoon twice daily and add another half teaspoon every 3 to 5 days. I’d shortlist it for someone specifically looking for acacia; buying a different fiber type is the reason to choose it over the psyllium options.
NOW Glucomannan: capsule pick
NOW Glucomannan’s label lists 2g total carbs and 2g fiber per 3 veg capsules, giving 0g net. The serving contains 1,725mg glucomannan from konjac root. Other ingredients include the cellulose capsule and processing ingredients, so this isn’t a single-ingredient powder.
The tradeoff is capsule count: that serving supplies 2g fiber. NOW requires at least 8 oz water to prevent throat blockage or choking and says to avoid it with esophageal narrowing or swallowing difficulties. I’d consider capsules for convenience, but compare the fiber amount before deciding they’re the easier daily option.
How to choose
Read total carbs before the sugar-free claim
Start with the serving size, total carbs and fiber. Subtract only what the label actually lists. Then scan the ingredients for maltodextrin or sweeteners. Unsweetened Konsyl, NOW Psyllium and Viva keep that decision simple; Heather’s offers acacia, and NOW Glucomannan offers capsules.
Match the comparison to how much you’ll actually take. A teaspoon, tablespoon and capsule serving aren’t interchangeable measures. Choose the format and ingredient first, then follow that package’s directions rather than borrowing a dose from another brand.
Increase slowly and take the liquid directions seriously
Mayo Clinic advises adding fiber slowly over a few weeks. Increasing too quickly can bring gas, bloating and cramping. It also advises drinking plenty of water.
MedlinePlus says to take psyllium with at least 8 oz (240 mL) of liquid, mixing powder right before use. Follow a product’s larger requirement when specified. Ask your doctor or pharmacist before adding it if you take medicines or have swallowing difficulties; MedlinePlus flags both issues. It also advises against taking psyllium longer than a week unless your doctor directs it.
What to avoid
Metamucil Premium Blend Sugar-Free Orange: the label lists maltodextrin second, after psyllium husk. Per 2 rounded teaspoons, it prints 10g total carbs and 5g fiber, leaving 5g net. Stevia sweetening doesn’t erase that remainder. I’d choose the plain psyllium picks above for a tighter carb budget.
The separate Metamucil Sugar-Free Orange Smooth label also lists maltodextrin second. Its 2-rounded-teaspoon serving has 10g total carbs and 6g fiber, or 4g net. Don’t transfer one formula’s numbers to the other.
Citrucel Sugar Free: its DailyMed Drug Facts label lists maltodextrin and aspartame, and says a rounded tablespoon contributes 30 calories from maltodextrin. It prints no total-carb or dietary-fiber line, so an exact net-carb figure can’t be calculated. I wouldn’t buy it on the assumption that sugar-free means carb-free.
Benefiber: the brand label and older retailer listing give different serving sizes, so check the package before using a carb figure from an online listing. I’d start with the plain psyllium options above when you want a simple ingredient list and a clear serving to compare.
