BulkSupplements Glucomannan (Konjac Root)
BulkSupplements sells glucomannan konjac root extract as a single ingredient in bulk quantities from 100g to 1kg, with no added ingredients and no formulation story.
Last reviewed · researched from the manufacturer’s published pages by Tom
What’s in it
Amounts are shown only where the manufacturer publishes them. Anything without a figure is undisclosed — and for an active ingredient, an undisclosed dose is the central problem with this category.
- Glucomannan (konjac root extract)Sold by weight: 100g, 250g, 500g and 1kg sizes
Single ingredient, no blend
How the manufacturer says it works
BulkSupplements sells single ingredients by weight rather than formulated products, leaving dosing to the buyer.
What the evidence actually supports
Glucomannan is among the better-evidenced soluble fibres for satiety, with research generally showing modest effects alongside a reduced-calorie diet. Buying it as a single ingredient by weight removes formulation markup entirely and lets you control the dose against published research.
Where that evidence stops
Effect sizes for glucomannan are small — typically a couple of pounds over months relative to placebo. Crucially, glucomannan expands substantially in water and taken without adequate liquid can swell in the oesophagus, with documented cases of obstruction. Buying it in bulk powder form makes accurate dosing your responsibility, which raises that risk if you are careless.
Strengths and problems
Strengths
- Single ingredient with no formulation markup
- Sold by weight so you can dose against published research
- Available in sizes down to 100g to try before committing
Problems
- Bulk powder makes accurate dosing your responsibility — a real issue given the choking risk
- Glucomannan MUST be taken with a full glass of water; this is not optional
- No formulation guidance provided
- Pricing was not clearly published on the page we captured
What the manufacturer publishes
Publishes 1 of 8 standard terms.
- Intended use
- Sold as a dietary supplement, not as a treatment for any condition.
- Directions
- Not publicly disclosed on the pages we captured.
- Warnings
- Not publicly disclosed on the pages we captured.
- Allergens
- Not publicly disclosed on the pages we captured.
- Third-party testing
- Not publicly disclosed on the pages we captured.
- Pricing
- Sold by weight across 100g, 250g, 500g and 1kg sizes; pricing not clearly published on the page we captured.
- Subscription
- Not publicly disclosed on the pages we captured.
- Refunds
- Not publicly disclosed on the pages we captured.
- Shipping
- Not publicly disclosed on the pages we captured.
May suit
Someone who has read the research, wants to control their own dose, and will follow the fluid instructions carefully.
Do not use if
- You have any history of swallowing difficulty or bowel obstruction
- You will not reliably take it with a full glass of water
- You are taking it immediately before lying down
Sources
Captured . Manufacturer pages change — check the current version before relying on anything.