Quercetin phytosome is the clear leader in bioavailability with 50x greater plasma AUC than standard aglycone in controlled human pharmacokinetic studies. For senolytic applications where reaching therapeutic plasma concentrations is critical, phytosome is the recommended form. Standard quercetin with fat co-administration remains viable for anti-inflammatory continuous dosing where absolute plasma levels are less critical.

Is the most expensive quercetin always the best?

Not necessarily. Some mid-range phytosome products from reputable manufacturers offer excellent quality. The key criteria are form (phytosome for senolytic use), purity documentation, and third-party testing — not price alone.

Can I use food-derived quercetin concentrates?

Whole food-based quercetin concentrates (from onion extract, etc.) may contain quercetin glycosides with better bioavailability than aglycone supplements. However, dose standardization is harder to verify and total quercetin content may be lower.