3 valid forms with different bioavailability + safety profile · canon pro selenomethionine · avoid selenate/selenite megadose.
Selenium incorporated in methionine
Best for
Ideal use: longevity maintenance, Hashimoto, fertility, pregnancy, geroprotection.
Advantages
Bioavailability ~90% · natural organic form. Incorporated into proteins via methionine pool. Superior safety profile. No selenosis at standard doses.
Disadvantages
Expensive (~10-15 €/month at 200 mcg). Slow tissue accumulation · chronic background effect (not acute).
Se-yeast · 60-70% selenomethionine + 30-40% other organic forms
Best for
Ideal use: pure selenomethionine alternative, budget, no yeast allergy.
Advantages
Form used in original NPC trial (200 mcg/d Se-yeast effective). Diverse organic Se pool. Economical.
Disadvantages
Variable concentration per lot/manufacturer. Yeast can cause cross-reaction in sensitive subjects.
Common inorganic multivitamin form
Best for
Ideal use (limited): NOT recommended pro 2026 · avoid megadose · selenomethionine better.
Advantages
Extreme economy (~3-5 €/month). RDA legal label form.
Disadvantages
Bioavailability ~50% · NPC trial +20% T2D at 200 mcg chronic vs Se-methionine. Megadose selenosis (alopecia + brittle nails + garlic breath + neuropathy).
Ideal use: longevity maintenance, Hashimoto, fertility, pregnancy, geroprotection.
Ideal use: pure selenomethionine alternative, budget, no yeast allergy.
Ideal use (limited): NOT recommended pro 2026 · avoid megadose · selenomethionine better.
3 valid forms with different bioavailability + safety profile · canon pro selenomethionine · avoid selenate/selenite megadose.