Glucosamine
Glucosamine
is a supplement derived from shellfish. Glucosamine is primarily sold as a
joint health supplement. Studies show that supplementing glucosamine sulfate
will reduce the rate of collagen (joint tissue) degradation and symptoms of osteoarthritis.
Though glucosamine is comparable to acetaminophen, the reference drug for
osteoarthritis, in potency, it is not as reliable.
Studies on
athletes supplementing glucosamine are limited, but preliminary evidence
suggests doses as high as 3,000mg of glucosamine sulfate may be able to slow
joint degradation. This effect is most relevant for athletes participating in
high impact sports, like running. Though preliminary evidence suggested
glucosamine supplementation could cause insulin resistance, follow up studies
conclude that glucosamine supplementation does not affect glucose metabolism.
Glucosamine is very safe to supplement and its most common side-effect is
flatulence. Glucosamine supplementation cannot cure osteoarthritis, but it can
slow the progression of the disease.
How to take
To
supplement glucosamine, take 300 – 500 mg, three times a day, for a total daily
dose of 900 – 1,500 mg. The benefits of glucosamine are dose-dependent, and
studies use up to 2,000 – 3,000 mg a day, taken in several doses. Glucosamine
sulfate salts are the best way to supplement glucosamine, with glucosamine
sulfate as a close second. Glucosamine hydrochloride is ineffective.
N-Acetylglucosamine is not glucosamine and should be considered a different
supplement. Glucosamine should be supplemented alongside food.
Side effects and warnings
Glucosamine
is likely safe when taken by mouth in studied doses (500 milligrams three times
daily up to 90 days or 1,500 milligrams once daily up to six months) for a
short time by healthy adults. Glucosamine sulfate is likely safe when injected
into the joint at recommended doses for up to six weeks (not available in the
United States).
Glucosamine
is possibly safe when taken by mouth in recommended doses for up to three
years. Doses of up to 3 grams daily and higher have been used in people with
osteoarthritis.
Use
cautiously in women who are, or plan to become, pregnant, or are breastfeeding.
Use cautiously in children under 18 years old.
Drowsiness
or sedation may occur. Glucosamine may also cause insomnia. Use caution if
driving or operating heavy machinery.
Use
cautiously when taking recommended doses over a long time period or if injected
into the muscle. Use cautiously if using doses higher than those recommended.
Use cautiously in people with low blood platelet counts, as glucosamine may
interact with antibodies.
Glucosamine
may increase the risk of bleeding. Caution is advised in people with bleeding
disorders or taking drugs that may increase the risk of bleeding, such as vitamin
K antagonists (warfarin). Dosing adjustments may be necessary.
Glucosamine
may affect blood pressure. Caution is advised in people with high blood
pressure or heart conditions, or those taking drugs or herbs and supplements
that affect blood pressure. Glucosamine may cause abnormal heart rate and
palpitations.
Glucosamine
has been recommended for a range of conditions and illnesses, but studies have
tended to be inconclusive, or have found it ineffective, or possibly harmful,
for example, in people with an allergy. There is no evidence, for example, that
it either helps or does not help people with sports injuriesor
with chronic lower back pain. There are no scientific studies to suggest
that glucosamine is either beneficial or detrimental for people with venous
insufficiency
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