The four members of my immediate household have all been vaccinated and, obviously, I have been able to observe them in the time since (the last received their second dose in late May).
1. Pfizer; continues to work full-time at a very detail-oriented job that has also included training two new employees in the same job.
2. Moderna; continues to work full-time and completed an AA degree.
3. Pfizer; completed an AA degree and started a very detail-oriented full-time job; works out regularly with hand weights and other core exercises; assists a Tibetan- and Mandarin- speaking friend with translating materials from English to Mandarin (this family member is fluent in Mandarin as well as English) as part of his work for a doctoral degree.
4. Pfizer; continues to work full-time; resumed regular work-outs at the gym, doing both cardio and weights.
Based on my obviously limited observations, I'd say that the "jabs" did little or nothing to our "brains and other organs".