B9 i.e. folate, i.e. Folic Acid will increase your alertness

B9, or folate, or folic acid, like all B vitamins, is very important for the proper functioning of the body and nervous system.

Folate and vitamin B12 work together.

It's good to remember that you can only get vitamin B12 from animal sources. 

Also unlike other B vitamins, B12 is also stored to some extent.

If you eat a variety of fresh or lightly cooked vegetables, there may not be a shortage of B vitamins, but because they are water-soluble, they are eliminated from the body quite quickly.

They can also dissolve in water during cooking and be partially or even completely destroyed.

Perhaps that is why, even though fresh food is available all year round, a large number of people still have a folic acid deficiency.
Vitamin B9, or folic acid, is one of the most important B vitamins.

In addition to grains, other good sources of folic acid include fresh vegetables, berries, and fruits. They are low in protein but are good sources of carbohydrates.

Several studies have shown that vitamin B9 plays an important role in the formation of red blood cells, but an even more important role is related to the breakdown of harmful substances and is believed to reduce the risk of cardiovascular disease.