The same could be said for L-theanine, an amino acid found in green tea that is added to some supplements because of its
. No large, rigorous trials have shown that L-theanine improves cognition, said Dr Pieter Cohen, an associate professor of medicine at Harvard Medical School.have found links between better cognitive performance and high consumption of dietary choline, an essential nutrient that occurs naturally in fish, eggs, poultry and dairy and is added to some cognitive enhancing supplements. But no thorough studies have proven that supplemental choline itself directly leads to cognitive benefits.
“There’s obviously a lot of marketing attached to these things, which makes it sound like they have an air of scientific credibility,” said D Craig Hopp, a deputy division director at the National Center for Complementary and Integrative Health. “If you dig deeper into that science, it’s sometimes rather shakyIn addition, some blends that market brain-boosting benefits may even contain unapproved or unlisted stimulant drugs, Dr Cohen said.
Of the eight supplements they tested that advertised cognitive-enhancing benefits, two contained brain-stimulating drugs that were not listed on the product’s labels. These included phenibut and picamilon, which have been used in Russia to treat certain mood disorders and alcohol withdrawal. Phenibut has the potential to be addictive, DrCohen said.
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