There are several natural ingredients that can be used as the leather conditioner like coconut, oil, baby oil and lemon. However olive oil can’t be used as the conditioner as it will worsen the condition than preventing the damage. Therefore it is recommended to use dr jackson’s leather conditioner for the professional outcome.
If you don’t have leather conditioner then you can use coconut oil as well for the purpose. It is hypoallergenic and won’t spoil the condition.
If you don’t want to buy fancy leather conditioner then you can use petroleum jelly as well. But the output is not sure therefore it is recommended to use professionally made leather conditioner for your expensive leather goods.