Worshipping Shri Vishnu with tulsi leaves helps one in getting cured of incurable diseases.

Om Namo Narayana ~ Jai Shri Vishnu! 🍃🙏🏻🍃🌷🍃🌷🙏🍃

Worshipping Shri Vishnu with tulsi leaves helps one in getting cured of incurable diseases. Because Tulsi was born on the lunar day of the full moon in the month of Kartik, Lord Narayana prescribed this day for her worship. Whoever worships her on this day and on the month of Kartik will be freed from all sins and go to Vaikuntha. Whoever, out of reverence, gives Lord Vishnu a Tulsi leaf in the month of Kartik, will gain the same benefit obtained by giving the gift of ten million cows. Among all articles which are offered to Shri Vishnu, tulsi is most highly praised. Therefore one may perform perfect worship of the Lord by simply offering pure water and tulsi leaves.

According to the Garuda Purana, tulsi must always be offered in the naivedyam. "Tulsi vina ya kriyate na puja, snanam na tat yat tulasivinakrtam ; bhuktam na tat yat tulasi vinakrtam, pitam na tat yat tulasi vinakrtam"
Means ~ Puja, bathing and offering of food and drink performed without tulsi cannot be considered as puja, bathing and offering to the Lord. The Lord does not accept anything or drink anything that is without Tulsi, as per Brihad Naradiya Purana.

As per Padama Purana, one who worships Shri Vishnu/ Krishna with Tulsi leaves attains the results of all kinds of austerity, charity, and sacrifice. In fact, he has no other duties to perform, and he has realized the essence of the scriptures. Padma Purana states one who puts mud from the base of Tulsi tree on his body and worships the Deity of Lord Krishna gets the results of one hundred days worship each day! 🍃🌷🍃🕉🌷🍃🍃🍃🌷🍃🌷🍃🕉🍃

Om Namo Bhagwate Vasudevaya Namah ~ Om Namo Narayana ~ Om Namah Shivaya 🕉🍃🌷🍃
Shubh Prabhat 🍃🍃🌷🍃🕉