Given his results, while I might try just high dose serine first, adding NAC, nicotinamide riboside, glycine and carnitine also makes sense, as Mardinoglus research suggests

Major Ingredients Water, Centella Asiatica Extract (25.3%), Glycerin, Cetyl Ethylhexanoate, Butylene Glycol, Polyglyceryl-3 Methylglucose Distearate, Niacinamide (20,000ppm), Beeswax, Stearic Acid, Sodium Polyacryloyldimethyl Taurate, Silica, Sodium Hyaluronate, Glyceryl Stearate, Butyrospermum Parkii (Shea) Butter, Macadamia Ternifolia Seed Oil, Hydrogenated Polydecene, Betaine, Glutathione (1,000ppm), Trehalose, Adenosine, Citric Acid, Trideceth-10, Disodium EDTA, Sodium Citrate, Nelumbo Nucifera Extract, Artemisia Annua Extract, Oryza Sativa (Rice) Extract, Saccharomyces Ferment, Solanum Melongena (Eggplant) Fruit Extract, Melaleuca Alternifolia (Tea Tree) Leaf Extract, Hydrolyzed Collagen, Caprylic/Capric Triglyceride, Hydrogenated Lecithin, Xanthan Gum, Carbomer, Arginine, Squalane, Beta-Glucan, Dipropylene Glycol, Hippophae Rhamnoides Fruit Extract, Madecassic Acid, Asiaticoside, Asiatic Acid, Propanediol, Hydroxyacetophenone, 1,2-Hexanediol, Ethylhexylglycerin, Dipotassium Glycyrrhizate Ingredients subject to change at manufacturer's discretion

Also and excellent glucose for baking
Siddiqui MN, Mostofa MG, Rahman MM, Tahjib-Ul-Arif M, Das AK, Mohi-Ud-Din M, Rohman MM, Hafiz HR, Ansary MMU, Tran L-SP (2021) Glutathione improves rice tolerance to submergence: insights into its physiological and biochemical mechanisms