Razlo can heal the Vault Dweller, and offers a small amount of stimpaks for purchase, although he will only enter into dialogue with the player during daylight hours. At night, he will become very irritable if you wake him through dialogue, telling you to return in the morning. Also after the Vault Dweller completes the Make Poison Antidote quest he will accept any radscorpion tails and use them to create more anti venom for the Vault Dweller.
A bug can be exploited to have Razlo heal you for free. When he demands money for healing, you can claim you don't have enough and then offer a trade in exchange for healing. The barter window will show up and you can be healed for free by simply going back to the dialogue window.[verification overdue]
After Tandi is kidnapped, the Vault Dweller can talk to Razlo about it upon which he gives them stimpaks and fruit. If they come back at night and talk to him again about it, he will hand over the same amount of stimpaks and fruit again. [verification overdue]