Dileucine is different
Journal of Pakistan Association of Dermatologists, July-September 2016, ePublication 6
* Previously Glutathione Plus Topical - NBX Wellness Brand Neuro Biologix Allergen Information Allergen Free Ingredients Active Ingredient: L-Glutathione Ingredients: Water, Medium Chain Triglycerides, Ethanol, Sunflower Lecithin, Glycerin, L-Glutathione (Reduced), Polyacrylamide (And) C13-14 Isoparaffin (And) Laureth-7, Acrylamide/Sodium Acryloyldimehtyl Taurate Copolymer (and) Isohexadecane, Polysorbate 80, N-Acetyl Cysteine, Sodium Hydroxymethylglycinate, Glucosamine Sulfate, L-Carnosine, Xanthan Gum, Natural Lemon Flavor, Sodium Phytate, D-alpha Tocopherol (Vitamin E), Potassium Sorbate, Orange Essential Oil, Lavender Essential Oil, Geranium Essential Oil, Rosewood Essential Oil, Frankincense Essential Oil, Niacin (Vitamin B-3), Folinic Acid, Methylcobalamin (Vitamin B-12)

In erythrocytes, the absence of S1P-degrading enzymes allows these cells to produce and store substantial amounts of S1P ( eENT1, a crucial purinergic cellular component, regulates plasma adenosine levels in humans at high altitudes and in hypoxic mice (Song et al., 2017)
It is for this reason that the latter is not routinely available on the NHS and hydroxocobalamin is the preferred treatment
When you have more glutathione in your system, your entire body works better