What are some home remedies that I can administer to my dog to aid with separation anxiety?

Name: Ankit Date of Birth: 5 March 1990 Place of Birth: Delhi Time: 07:50 AM. Hi, my dog has come down with extreme separation anxiety since I began working more hours. He whines, scratches on the door, and even chews furniture at times when left by himself. I have attempted to leave toys around and play soothing music, but nothing works. I don't want to medicate him unless absolutely needed. I've read about natural remedies like CBD oil, valerian root, and pheromone diffusers, but I have no clue what is safe for dogs and actually works. Are there any vet-recommended natural remedies that can alleviate his anxiety and make him feel safer when I'm not around? I'm searching for something non-invasive, effective, and easy to add to his regular routine.