Blueberries in particular may improve motor skills and reverse age-related short-term memory loss, and may also protect the brain from stroke damage
References: Mathapati S, Siller R, Impellizzeri AA, Lycke M, Vegheim K, Almaas R, Sullivan GJ. Small-Molecule-Directed Hepatocyte-Like Cell Differentiation of Human Pluripotent Stem Cells. Curr Protoc Stem Cell Biol. 2016 Aug 17;38:1G.6.1-1G.6.18. doi: 10.1002/cpsc.13. PubMed PMID: 27532814
This adds another layer of evidence to the 2004 Study by Bock-Marquette et al
If you experience these symptoms, reduce your dose or split it into smaller, more frequent injections
It's the right place to start
They say its unclear whether those steps were followed in this case