FlexGuard Official Website › Blog › Hypromellose and Rice Flour
What Are Hypromellose and Rice Flour Doing in FlexGuard?
Hypromellose is the plant-based capsule shell, and rice flour is a filler that helps a small amount of powder fill the capsule. They are FlexGuard's only inactive ingredients. The shell is plant material, but the glucosamine inside comes from crayfish shell, so the product is not vegan or vegetarian.

Most people read the big numbers on a Supplement Facts panel and skip the small print under them. Yet the line that starts with other ingredients answers some of the questions buyers ask most.
Is the capsule vegetarian? Is there any gelatin? Is the formula natural? This page reads that one line and the lines around it, using only what the label and the seller publish.
What are the other ingredients in FlexGuard?
Two. The label reads: hypromellose (vegetable capsule), rice flour. Nothing else is listed under that heading.
| Item | What it is | Its job |
|---|---|---|
| Hypromellose | A plant-derived material | Forms the capsule shell |
| Rice flour | A flour | Acts as a filler so a small amount of powder fills the capsule |
Roles as described on the site's supplement facts page.
Two inactives is a short list for this category. The site counts that as a point in the label's favour, because a long list of fillers, sweeteners and colours is worth a second look on a product taken every day.
What is hypromellose, and does it make FlexGuard vegetarian?
Hypromellose is plant-derived. It is the same material the label calls a vegetable capsule. There is no gelatin in the shell.
That does not make the product vegetarian or vegan. A capsule is a wrapper, and the contents matter as well. The glucosamine inside is made from crustacean shell, and the panel declares Contains: Shellfish (Crayfish).
So the wrapper is fine for a plant-based diet and the contents are not. This is the one fact on the label that makes the product unsuitable for some people, not just a poor fit. If you avoid shellfish or animal products, stop here and choose another product.

The site reproduces the panel line for line, and the checkout shows the current price for each pack.
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Disclosure: this desk earns from orders placed through the checkout on this site. BuyGoods, the retailer at the checkout, shows the current price.
What does rice flour do in a capsule?
A joint formula with eight actives adds up to 699 mg of powder in one capsule. That is a small amount, and a capsule shell is larger than that. A filler such as rice flour takes up the space.
The label does not publish how much rice flour is in each capsule. It does not publish the weight of the shell either. The percentages on the site's ingredients page are shares of the 699 mg of declared actives, not of the whole capsule. Those weights are not published.
The only declared allergen on the panel is shellfish. Rice flour is not flagged as an allergen on the label.
Is FlexGuard a capsule, a pill, a tablet or a gummy?
It is a capsule that you swallow, one a day, with 30 in each bottle. It is not a gummy and not a powder. Searches for FlexGuard pills, tablets or gummies are really asking about this one capsule.
There is no sweetener, flavouring or colouring in the formula. That follows from the short list above. A gummy usually needs those. A capsule does not.
The seller publishes no size or weight for the capsule itself. If swallowing is a problem for you, that is a question for a doctor or pharmacist, and the order desk cannot see your throat.
Is FlexGuard all natural?
The label and the seller's pages published here make no all-natural claim. So this page does not make one for them.
What the label does say is plain: the ingredients are named, the amounts are printed, and the plant parts are given where the label gives them, such as root, bud, herb and stem. One row, glucosamine sulfate, is made from crustacean shell. Another, methionine, is an amino acid.
The label also states: Manufactured in the USA with globally sourced ingredients. Natural is not defined on the label, so treat the word as a marketing term and read the rows instead.
What else is printed under the panel?
Three things are worth reading before you open the bottle.
- The caution: not for anyone under 18, not for anyone pregnant or nursing, do not exceed the stated dose, and speak to a physician first if you take a medication or have a medical condition.
- The storage line: keep it in a cool, dry place below 30°C (86°F).
- The seal line: keep out of children's reach, and do not use the product if the safety seal is damaged or missing.
The storage guide on this blog goes through the second and third lines in more detail.
What does this mean for your decision?
If you want a short inactive list and a plant-based shell, FlexGuard meets both. If you need a vegetarian or vegan product, it does not, whatever the shell is made of.
If you have a rice allergy, the label does not flag rice flour as an allergen, but the label is not a medical document. Ask a doctor, and keep the allergen line in front of you. The label is the authority, not a web page.
- Other ingredients: hypromellose (vegetable capsule) and rice flour.
- There is no gelatin. The shell is plant-derived.
- The glucosamine inside is made from crustacean shell. The product is not vegan or vegetarian.
- The panel declares Contains: Shellfish (Crayfish) and no other allergen.
- The weights of the shell and the rice flour are not published.
- No all-natural claim is published for the capsule.
Frequently asked questions
What are the other ingredients in FlexGuard?
Hypromellose, which forms the vegetable capsule shell, and rice flour. The label lists nothing else under other ingredients. It also declares Contains: Shellfish (Crayfish).
Is the FlexGuard capsule vegetarian?
The shell is plant-derived hypromellose, but the glucosamine inside it is made from crustacean shell. So the product is not suitable for a vegan or vegetarian diet.
Does FlexGuard contain gelatin?
No. The capsule is hypromellose, a plant-derived material, and the site lists no gelatin among the ingredients.
Why is there rice flour in the capsule?
It is a filler. The eight actives total 699 mg, so a filler helps that small amount of powder fill the capsule. The weight of rice flour per capsule is not published.
Is FlexGuard all natural?
No all-natural claim is published for it. The label names every row and its amount, and one row comes from crustacean shell. Read the rows rather than relying on the word natural.
Does FlexGuard contain sweeteners or colours?
None are listed. The only inactive ingredients are hypromellose and rice flour, and the site notes there is no sweetener, flavouring or colouring in the formula.
Our view
The other-ingredients line is short and clear, and that is a strength. We would still tell every reader the same thing: the shell is not the story. The crayfish line is.
If the panel fits your diet and your doctor agrees, nothing under the numbers should worry you. If it does not fit, no shell material changes that. The refund window gives you 60 days from purchase if you try it and decide against it.

Three bottles cover 90 days, and the 60-day guarantee counts from the day you pay.
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Disclosure: this desk earns from orders placed through the checkout on this site. BuyGoods, the retailer at the checkout, shows the current price.
FlexGuard is a dietary supplement. It is not a drug, it is not FDA approved, and no dietary supplement is. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Ask a doctor about your own health, medicines and joints.
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