Hey @denisetruetesthrt-com
The following is my NON MEDICAL understanding of the two. From there, someone from the community can weigh in from here.
From the Peptide Foundations course – Selank is a nootropic peptide, which is commonly used for its benefits in treating anxiety, depression and ADHD. In clinical trials, the drug has shown to provide sustained cognitive enhancement and reduction in anxiety without sedating or negative side effects. It influences memory and learning processes and has been shown to enhance cognition by altering the way that genes involved in neurotransmission are expressed.
Semax is for oxidative damage, stress, adhd, and memory.
Hope that helps!