It varies! Water-soluble vitamins (like the B-vitamins) absorb into the body quickly. Fat-soluble vitamins take longer to reach optimal levels, and omega-3 takes a while to exhibit effects, so patience is key!
Although some customers feel benefits from month 1, you won't get a feel for the full range of benefits Heights offers until month 3 and beyond. This is the point at which your brain reaches its new baseline.
We like to think of brain health as a pension plan or a lifelong journey, as opposed to a destination. The role of diet in protection from cognitive decline is huge (1,2), and it can take time to reach your new healthy 'normal'.