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An evidence-based 2026 UK guide for students, CEOs and high performers, ranking every option by human proof: the caffeine + L-theanine stack, creatine, omega-3, the prescription study drugs (modafinil), the racetam/peptide tier and why Dihexa, with no human study data, is not a study aid
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Vermeulen et al, 2000) and experimental (Bellamy et al, 1998
It is a powerful water-soluble antioxidant that is usually found in the liver
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