For premature ejaculation and immunity, Ayurveda offers highly effective herbs. Ashwagandha is excellent; it reduces performance anxiety, boosts stamina, and strengthens overall immunity. Safed Musli and Shatavari are also highly beneficial for improving vitality and sexual health. Additionally, taking Chyawanprash or Giloy daily will significantly enhance your immune system. While these herbs are generally safe, premature ejaculation can often be linked to psychological stress or lifestyle factors. I strongly advise consulting a certified Ayurvedic doctor for a personalized treatment plan and correct dosages based on your body constitution.