but Solgar was discontinued. Jarrow and Life Extension have also Se-Methyl-Selenocysteine. Jarrow only has a formula with this form of Selenium. Life Extension uses Sodium Selenite in lots of their products. This is not organically bound and will be absorbed poorly. I don't trust companies using Sodium Selenite. So back to L-selenomethionine. I took Carlson because of the low weight. The capsules are small so easy to take. Feel free to visit my page (click on my name) for more reviews.