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FlexGuard Ingredients: An 8-Row Label Checklist

By FlexGuard TeamMedically reviewed by Dr. Elizabeth Ortiz, MD, PhysicianReviewed October 16, 2026Last updated October 29, 20269 min readIngredients

What is on the FlexGuard ingredients list?

The Supplement Facts panel on the carton lists eight rows. Each has a weight. One capsule is the serving, and a bottle holds 30 servings.

Below the rows you will find the other ingredients: hypromellose and rice flour. Hypromellose is the capsule shell, and it is a plant material. Rice flour is the filler.

There is no magnesium stearate, silica, titanium dioxide or colouring listed. The site calls a two-item other-ingredients line short for this shelf, and a small point in the product's favour.

There are also no vitamins on the list, so a search for a “flex guard vitamin” will not match this label. This is a joint-focused capsule with plant, amino and enzyme rows.

Use the checklist below with the carton in your hand. For each row we give the amount, what the ingredient is, and one thing to check.

People look this up as flex guard ingredients, flexguard ingredients list, flexguard supplement ingredients, flex guard label, flexguard label, flexguard supplement facts or flexguard formula. All of them point at one panel. The wider search, joint supplement ingredients, leads to the same six names that fill most of the category, and the table in check 1 of the post on whether joint supplements work lists them.

Row 1: What is glucosamine sulfate, and what does 500 mg mean?

Glucosamine is an amino sugar that the body uses in cartilage and joint fluid. It is made from shellfish shell, which is why the carton declares an allergen.

The row is 500 mg, and it is 72% of the whole 699 mg. The long trials used 1,500 mg a day, and in the large ones it was 500 mg three times a day. So 500 mg once is a third of the trial amount, taken in one go.

Check: the salt form. The label says sulfate, which is the form the long European trial used. The American GAIT trial used the hydrochloride.

Row 2: What is Indian frankincense (Boswellia serrata) at 67 mg?

Boswellia is the resin of the Indian frankincense tree. Its boswellic acids are studied for effects on inflammatory signalling. A 2025 network meta-analysis ranked it first for pain and stiffness among the supplements compared.

The catch is the way it is listed. The row says herb, 67 mg, with no standardisation. The trials used extracts standardised to a stated percentage of AKBA, at 100 to 250 mg a day, or 999 mg a day of crude extract.

Check: ask yourself whether you can compare 67 mg of herb with 100 mg of a 30 per cent extract. The site says you cannot, and the federal rule does not require the figure.

Row 3: What is chondroitin sulfate at 50 mg?

Chondroitin is a long sugar chain found in cartilage. It is usually sold with glucosamine. The Cochrane review pooled 43 trials and 9,110 people. It found a small gain in pain in shorter studies, shrinking as study quality rose.

Most of those trials used 800 to 1,200 mg a day. The two-year STOPP trial used 800 mg. At 50 mg, FlexGuard carries a sixteenth of the lowest trial figure.

Check: the amount, not the name. A familiar name on a label does not mean a familiar dose.

Row 4: What is turmeric root at 50 mg?

Turmeric is the most-trialled plant in joint research. An umbrella review of eleven meta-analyses found improvement in pain scores. One 367-patient trial compared 1,500 mg of extract a day with ibuprofen for four weeks.

Absorption is the known problem. Curcumin on its own reaches the blood poorly, so many products add something to help. This row names the root, gives 50 mg, and names no absorption aid.

Check: the label does not say what share of the 50 mg is curcumin. Also note that a liver-injury case series exists for turmeric, almost all at far higher amounts than 50 mg.

Row 5: What is quercetin at 8 mg?

Quercetin is a flavonoid. Here it comes from the bud of the Japanese pagoda tree, not from onions or apples. It has drawn recent interest as a senolytic, a compound studied for clearing worn-out cells.

The pooled joint evidence is animal and laboratory work. No randomised trial has tested quercetin in human joints, at any amount.

Check: 8 mg is a number with nothing to compare it to. It is not a small version of a tested dose, because no tested dose exists.

Row 6: What is methionine at 8 mg?

Methionine is an essential amino acid with sulfur in it. It is in every protein-rich food. The body uses it to make S-adenosylmethionine, or SAMe.

The joint research belongs to SAMe, studied at 600 to 1,200 mg a day. Methionine is the building block, not the finished molecule.

Check: search results for the word on the label will show a different compound. A normal day's food supplies well over a gram of methionine.

Row 7: What is MSM at 8 mg?

MSM is methylsulfonylmethane, an organosulfur compound sold on the idea that it supplies sulfur for connective tissue. People who search “what is msm joint supplement” are asking about this row.

A 2017 review puts normal use at 1.5 to 6 grams a day. A 2023 trial in mild knee pain used 2 grams a day for twelve weeks. An earlier systematic review called the evidence promising and thin.

Check: 8 mg is roughly a two-hundred-and-fiftieth of that 2 gram amount.

Row 8: What is bromelain at 8 mg?

Bromelain is a mix of protein-digesting enzymes from pineapple stem, used in Europe for swelling after injury.

The studies are mixed. An open study used 200 mg and 400 mg a day and saw more at the higher amount. A placebo-controlled pilot at 800 mg a day did not beat placebo. A 16-week trial used 1,890 mg a day of a bromelain preparation.

Check: the evidence is dose-dependent, so a small amount is harder to defend. The site says the evidence is mixed at hundreds of milligrams and absent at eight.

What does the FlexGuard label leave out?

A label is a declaration. It is not a lab report. The site lists what this one does not settle.

Lot FLE-26/GO-6202 and reference FLE-6202-26-GO are filing references, not laboratory proof.

Read the full comparison on the ingredients page, and the panel itself on the supplement facts page.

Frequently asked questions

Sources named on this site

Our view

The best thing about this label is that you can read it. Eight rows, eight weights, no blend. That lets you do what we did here: put each printed number next to the number the research used.

The honest result is mixed. Glucosamine carries most of the capsule at a third of the trial amount. Chondroitin and turmeric are a small fraction of theirs. Four rows are at 8 mg, with little or nothing to compare them to. Boswellia cannot be compared at all without a standardisation figure.

That does not make the capsule useless, and it does not make it a bargain. It makes it a broad capsule at modest amounts. If that is what you want, and the shellfish line does not rule you out, the label gives you everything you need to decide.

Last updated October 29, 2026