Gotu kola is said to improve cognition and memory (healthy people often take it for memory) but Ive never heard anyone with ME say it was helpful to them and that didnt help my memory in any way. In my case my memory was helped B12 injections (standard B12 supplements didnt help) which I had 2 per week. (improvement happened after the 3rd injection so in the second week... Im back on those again now but this time improvement didnt happpen till after the 4th one). They dont help my working memory (eg for maths etc) but they helped my actual memory retrival of memories. Suddenly I had memory recall again (I'd been severely affected in that area). I had a deficiency of Molybdenum which I found out about by a hair test... and taking Molybdenum/zinc tablets within 3-5 days gave my working memory back to me, so that I was able to do maths in my head again (something I hadnt been able to do for years).