NASA / NA-Semax Amidate
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A stabilized N-acetylated, C-amidated analog of Semax (an ACTH 4-10 fragment) engineered for a longer half-life and better blood-brain-barrier penetration, taken by subcutaneous injection or intranasal drops for focus, BDNF modulation and neuroprotection. The parent Semax has decades of Russian clinical use, but the acetylated-amidated analog itself has essentially no controlled human trials, so effects are extrapolated from the parent and from user reports. Popular and generally well-tolerated in practice, but the evidence base for this specific molecule is minimal.
