Suicide by Redbull? I guess my friend is trying to do it. Is it possible, at least?

So I have this one friend who thinks about death a lot and he has some scars on his legs.
Since he is suicidal and he tries to hide it from other people he doesn't wan't to take pills but instead he wants to drink a lot of Redbull to make it look accidental.
I went to his house one day after school and he had a lot of Redbull cans on his fridge.
So is it possible to commit suicide by drinking Redbull?
How can I help him?
Suicide by Redbull? I guess my friend is trying to do it. Is it possible, at least?
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