One thing that really should have been added to the list though is silica. The strength and elasticity of veins is dependent on the structural proteins collagen and elastin. It is the decline of these structural proteins that lead to the weakness and varicosing of the veins. The article mentions vitamin C, which actually works by being a building block of collagen and elastin. They also mention gotu kola, which actually stimulates collagen synthesis. Silica though is also an important building block of collagen and elastin, and is a very common deficiency.