Senzu Beans have played a very important role in Dragon Ball Z over the years, healing anyone who eats them almost instantly. It would make sense that you would have access to it at some point in Dragon Ball Z: Kakarot, which is exactly the case. You do, however, need to complete a quest to get them and this guide will tell you how you can do that in the game.
How to Get Senzu Beans
The first step to getting Senzu Beans comes when you visit Korin's Tower during the Android Saga in the game and Yajirobe asks you to find two items, Sage Water and Godly Grow Fertilizer.
As shown in the image above, you will find the first item you need for Yajirobe by the water. Just follow the icon on the map and when you approach the water, look for the pink orb. This can be easily detected by holding L1 on PS4 to search for ki and it will make the orb more visible. Once you interact with this orb, you will have received the sage water.
Now we need to search for the other remaining item you need to find for Yajirobe, which you can find by following the icon quest icon. You can fight here with a Kyuconman, a more powerful version of the Saibaman, near here as well. Again, use your ki to search for a pink orb around the ground as seen in the image above. When interacting with the orb, you will now have the Divine Growth Fertilizer in your possession.
With these two items, do not return to Korin's Tower to give them to Yajirobe, who tries to pretend to have found them. Korin is wise enough to know that's not true and tells Goku he can come back whenever he needs to get Senzu Beans. You won't get the Senzu Beans from this conversation, so talk to Korin again after the scene and you'll get two. From then on you can return to Korin and get more over time, you have to wait between each time you get them from him.