the honest EFSA 2011 non-substantiation and the excellent safety record (GRAS status, no serious effects to 900 mg/day) versus Dihexas unproven HGF/c-Met synaptogenesis, the fosgonimeton LIFT-AD failure and the pro-proliferative c-Met concern, and why the cheap, safe, legal tea amino acid wins comprehensively
What the label describes as glutathione may in practice be partially spent material
His central insight: don't try to deliver the molecule, give the cell what it needs to build the molecule itself
doi: 10.1096/fj.07-102731 286 SafaiyanS.Besson-GirardS.KayaT.Cantuti-CastelvetriL.LiuL.JiH.et al
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[6] First-line pharmacological treatments include phosphodiesterase type 5 (PDE5) inhibitors, which are licensed, well-studied medications: Sildenafil (Viagra): Typically effective within 30-60 minutes, lasting 4-6 hours [7] Tadalafil (Cialis): Longer duration of action (up to 36 hours), also available as daily low-dose formulation [8] Vardenafil (Levitra): Similar efficacy to sildenafil with slightly different pharmacokinetics Avanafil (Spedra): Take approximately 30 minutes before sexual activity