what is the reduced form of glutathione vs liposomal outperforms plain glutathione in uptake, cell regeneration and systemic availability: evidence from cellular and human models L-Glutathione 500mg Reduced glutathione, an essential antioxidant

89 It also induces a cytostatic effect on the cell cycle by deregulating extracellular signal-regulated protein kinases and subsequently suppressing cyclin E and cyclin-dependent kinase

Your body absorbs whatever you take in

Since B12 is water-soluble and any unused B12 in the body is excreted through urine, consuming more than the daily amount or taking vitamin supplements of up to 1000 mcg a day is considered safe

A typical nasal pump delivers ~100mcg per spray, so a 300mcg dose = 3 sprays

For our purposes, it is sufficient to note that the most recent and comprehensive of these (Calvi et al., Reference Calvi, Quassolo, Massaia, Scandurra, D'Aniello and D'Amelio2020) records 42 studies, including the two mentioned above, in which human body odours have been collected and presented to human receivers