If you are going to supplement with selenium then I would recommend using a supplement such as this one which contains selenium in addition to other ingredients that help support thyroid conversion and function

Group T, Kaptoge S, Pennells L, De Bacquer D, Cooney M, Kavousi M, Stevens G, Riley L, Savin S, Khan T, Altay S, Amouyel P, Assmann G, Bell S, Ben-Shlomo Y, Berkman L, Beulens J, Bjrkelund C, Blaha M, Blazer D, Bolton T, Beaglehole R, Brenner H, Brunner E, Casiglia E, Chamnan P, Choi Y, Chowdry R, Coady S, Crespo C, Cushman M, Dagenais G, D'Agostino R, Daimon M, Davidson K, Engstrm G, Ford I, Gallacher J, Gansevoort R, Gaziano T, Giampaoli S, Grandits G, Grimsgaard S, Grobbee D, Gudnason V, Guo Q, Tolonen H, Humphries S, Iso H, Jukema J, Kauhanen J, Kengne A, Khalili D, Koenig W, Kromhout D, Krumholz H , Lam T, Laughlin G, Ibaez A, Meade T, Moons K, Nietert P, Ninomiya T, Nordestgaard B, O'Donnell C, Palmieri L, Patel A, Perel P, Price J, Providencia R, Ridker P, Rodriguez B, Rosengren A, Roussel R, Sakurai M, Salomaa V, Sato S, Schttker B, Shara N, Shaw J, Shin H, Simons L, Sofianopoulou E, Sundstrm J, Vlzke H, Wallace R, Wareham N, Willeit P, Wood D, Wood A, Zhao D, Woodward M, Danaei G, Roth G, Mendis S, Onuma O, Varghese C, Ezzati M, Graham I, Jackson R, Danesh J, Di Angelantonio E

Snack: Caramelised peach or apple with cottage cheese on sourdough
individuals with retinopathy prior to the index event were excluded from the retinopathy outcome analysis, etc.)
According to the IRS, generally any expense that doesn't meaningfully promote the body's proper function or prevent or treat illness or disease is not HSA- or FSA-eligible
This stability has practical implications for research design, as it opens the door to oral administration routes in experimental models where most peptides would require injection