There is some evidence that arginine in rather large doses provide a boost in blood nitrates. Nitrates, as in nitroglycerine, are an aid to people with ischemic angina so, in the future arginine may be used as replacement ot an adjunct to beta-blockers or calcium channel blockers.
Believe me, supplement manufacturers are digging wide and hard for evidence to make this already big seller, a GARGANTUAN seller.
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One hundred-fifty-three patients (mean age, 60.3 years) who had had a first acute myocardial infarction three to 21 days previously were randomly assigned to receive, in double-blind fashion, L-arginine or placebo for six months. The dose of L-arginine was 1 g three times a day for the first week, 2 g three times a day for the second week, and 3 g three times a day thereafter. Six participants (8.6%) in the L-arginine group died during the study period vs. none in the placebo group (p = 0.01). Because of safety concerns, the study was terminated prematurely.
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My personal experience was a couple decades ago then the Shaw/Pearson nonsense about arginine/ornithine being a stimulant of growth hormone release for musclle growth and "eternal youth." After wasting a goodly amount of cash on 6 grams a day of arginine for a couple months, I realized I was being taken for a ride again. I was more trusting of specious claims back then.
Don't waste your money until they can come up with some hard data that isn't filled with too many "may's," "could's," "might's," and "seem's."
If anyone wants to try arginine supplementation make sure you put it in perspective:
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The typical dietary intake of L-arginine is 3.5 to 5 grams daily. Most dietary L-arginine comes from plant and animal proteins. Soy protein and other plant proteins are richer in L-arginine than are animal proteins, which are richer in lysine. It is thought that the possible hypocholesterolemic effect of soy protein is due, at least in part, to the higher L-arginine content in this protein.
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Thus adding a gram of an expensive supplemtn isn;t going to do much.