One-A-Day Glucosamine HCL 1500

Glucosamine hydrochloride is the form in most combination joint products, so our naturopaths usually talk it through alongside chondroitin. These are the questions they ask in store.

A good fit if

• You're taking it with chondroitin, where the combined evidence is stronger
• You want more glucosamine per capsule than the sulfate gives you
• You'd rather know the evidence for it on its own is weaker than be sold a certainty

Check with us first if

• You have asthma. It's named as a group to take care, alongside shellfish allergy.
• You take warfarin. It's named as a caution, though the same review reports no significant interaction has been found.
• You take diabetes medicine. In one trial, 90 days of glucosamine hydrochloride with chondroitin didn't change blood sugar control, but it's still named as a group to take care.
• You're pregnant or breastfeeding. Glucosamine hydrochloride itself has no warning, but combination products usually contain chondroitin, which must be labelled not for use in pregnancy.
• The product also contains sodium chondroitin sulfate, which must be labelled adults only.

• Glucosamine hydrochloride (item 2367). Best known for: More glucosamine in each gram, and the salt most combination products use. Absorption: About 26% of glucosamine taken by mouth reaches the blood. Typical use: Best paired with chondroitin; its record on its own is weaker.
• Glucosamine sulfate (item 2368). Best known for: The salt most positive single-ingredient trials used. Absorption: The same oral glucosamine figure applies. Typical use: The pick if you're taking glucosamine on its own.
• Glucosamine sulfate potassium chloride (item 2369). Best known for: A trial-grade sulfate salt, very common on shelves. Absorption: The same oral glucosamine figure applies. Typical use: Carries a mandatory kidney and heart warning.
• Corn-fermented glucosamine hydrochloride. Best known for: The same molecule, made without crustacean shell. Absorption: Not detected in stool samples at 3,000 mg a day, which fits with it being absorbed. Typical use: The option if shellfish allergy or a vegan diet rules out the shellfish-derived kind.

Reference values. There's no recommended intake for glucosamine hydrochloride, because glucosamine isn't a nutrient.

Typical supplemental range. Australian labels usually suggest 1,500 mg a day of glucosamine, often with 1,200 mg of chondroitin. That combination is the dose most of the trials we've drawn on used.

Upper level. Australia's permitted ingredients list (Schedule 1) sets no daily maximum for glucosamine hydrochloride. The highest dose tested in the research we reviewed was 3,000 mg a day of corn-fermented glucosamine hydrochloride, taken for three weeks, with no side effects reported.

Worth knowing. Give it two to three months before you decide whether it's helping. What you need depends on your age, diet and health, so talk to one of our naturopaths.

Food first, where the diet allows it.

• None meaningful: glucosamine hydrochloride isn't eaten in useful amounts.

If any of these sound like you, talk to one of our naturopaths or your doctor before you start.

• Shellfish allergy. Most glucosamine hydrochloride is made from crustacean shell. Of 366 Australian side-effect reports on glucosamine and chondroitin products, 263 (71.85%) were allergic (hypersensitivity) reactions, 43 of them severe.
• Asthma. It's named alongside shellfish allergy as a group to take care with.
• Warfarin. It's named as a caution, although the same review reports no significant interaction. Talk to your prescriber.
• Diabetes medicines. Named as a group to take care with, though 90 days of glucosamine hydrochloride with chondroitin didn't change HbA1c in one trial.
• Pregnancy and breastfeeding. There's no Schedule 1 warning on glucosamine hydrochloride itself, and no trial data either. Combination products with chondroitin are usually labelled not for pregnancy.
• Children. There's no trial in children. Combination products with sodium chondroitin sulfate must be labelled adults only.
• If you take prescription medicines, check with your doctor, pharmacist or our naturopaths before you start.