Your Carrot Juice is a valuable health recovery item in F.I.S.T Forged in Shadow Torch. Without it, Rayton would be in dire straights for a long time. Even though you only get a few uses of it until you find three EP Compounds to earn an extra bar. You can upgrade it, however, so it restores more health.
To upgrade your Carrot Juice, you need Plant Seeds, but first, you need to progress through the story until you rescue Pippin from the Prison. Then once you reach Joffre Street, you may find Pippin crying over his lost seeds. He'll mention in return to finding his lost Plant Seeds.
By now, you may have a fair few on you, so speak to Pippin a few times until he stops showering you with money and items as well at certain intervals. When we got out first Carrot Juice upgrade to make it Carrot Juice Level 2, we had 10 Plant Seeds in total.
The more Plant Seeds you find and give you Pippin, you'll eventually be able to upgrade the Carrot Juice again. We believe the maximum level of Items is Level 3.
Looking for more F.I.S.T. Forged in Shadow Torch guides? ProGameGuides has you covered!