Is sublingual glutathione as effective as injectable glutathione?

Glutathione: comes in 3 forms; oral, sublingual and IV. Oral form is useless because it is broken down before it can be effective. IV is most effective because it is put directly into the bloodstream. Sublingual COULD be effective, but it depends entirely on the manufacturer making a form which is rapidly absorbed. Since this is unregulated, most companies just want your money.