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They are! There is a lot of research about Omega 3 and it is also neuroprotective so very important.
Research also shows that around 50% of vitamin D reserves can be lost (used) following a brain injury and in turn this affects vitamin B levels.
Iron, folates and vitamin D are the three major areas of deficiency found however micronutrient levels are very rarely tested and doctors tend to treat the symptoms of deficiencies with drugs!
https://globalbia.org/supplements-to-support-you-brain-environment/