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Wiehle R, Fontenot G, Willet M et al
A: Injections are more effective for individuals with absorption issues or who need rapid nutrient restoration
The authors administered oral Dihexa to APP/PS1 transgenic mice (a standard amyloidopathy model of Alzheimers disease) and showed that brain AngIV levels were elevated relative to wild-type after Dihexa administration, that spatial learning and memory were restored on Morris water maze testing, that hippocampal neuronal density and synaptophysin protein expression were preserved, that astrocyte and microglial activation were reduced, and that pro-inflammatory cytokines (IL-1, TNF-) decreased while anti-inflammatory IL-10 increased
They sit near the top of the evidence hierarchy, just below meta-analyses (which combine multiple RCTs)