In traditional Ayurveda, shilajit is considered a rasayana (rejuvenating substance) and is indeed often combined with herbs like ashwagandha or triphala. The fulvic acid in shilajit may act as a natural carrier, potentially aiding the absorption of the active compounds from other supplements.
A common approach is to take shilajit in the morning, dissolved in warm water or milk, perhaps 15-30 minutes before or alongside other supplements. It's best to start with shilajit alone for a week or two to observe how you feel before introducing combinations. Always follow the recommended dose for each product and do not exceed it. If you take prescription medication or have a chronic condition, consult a doctor before combining supplements.