Apparently aspartic acid and phenylalanine are ingredients of an artificial sweetener called aspartame (these two ingredients are in mutant mass).
Then I read this and similar finds....
"Of the artificial sweeteners, Aspartame is among the worst. It damages insulin sensitivity more than refined sugar does. It is also among the most common, used in numerous low-calorie drinks and processed foods.
Aspartame is also ototoxic. It damages hearing and causes or worsens tinnitus. (See our previous article, Neurotoxins and Tinnitus.
An excitatory neurotransmitter, Aspartame also excites brain neurons and increases levels of electrical activity in the brain and auditory cortex. This eventually destroys the neurons and leads directly to hearing loss and tinnitus."
This is worrying, I hope I haven't made any permanent damage if this is the case, I went through a whole 6.8kg sack before, I noticed my tinnitus fade slightly when I finished it but after ordering a different flavour and taking it for a week the ringing has gotten worse and it usually settles with time off work and it didn't this time when drinking the new flavour.