Can You Take Phenylalanine with Selenomethionine?

Research shows that taking Phenylalanine and Selenomethionine together does not cause any significant interactions. A study from 1971 found that elevated blood levels of methionine and phenylalanine did not affect the brain uptake of selenomethionine Se 75. This suggests that these supplements can be taken together without concern. No mechanistic evidence was found explaining how Phenylalanine and Selenomethionine interact. Amino acids like phenylalanine and selenomethionine are typically absorbed and metabolized through different pathways, which may explain the lack of interaction.