The 55mcg of selenium in Doctor's Best is the Recommended Dietary Allowance, or the minimum amount you should have to avoid deficiency
Structural characteristics: GHK-Cu supports tight copper chelation while maintaining aqueous solubility and compatibility with biological matrices, enabling reproducible dosing and consistent behavior in in vitro, ex vivo, and in vivo research systems
It makes for a much more efficient delivery method of the active GHK-Cu, which can penetrate through the layers of skin through injection, but that doesn't come without its risks
Chew thoroughly before swallowing
Galvez-Contreras AY, Campos-Ordonez T, Gonzalez-Castaneda RE, Gonzalez-Perez O (2017) Alterations of growth factors in autism and attention-deficit/hyperactivity disorder
Whats more, the phospholipids themselves are therapeutically useful nutrients with many health benefits