Notes

Interviews:

Dr Yervin Q1: Could've been because he was the teacher's "pet"
Dr yervin Q2:Seems suspicious, he might be part of the "minority"
Sam Q1: The arguing could've caused some stress and anger between them
Sam Q2: He says "Nelson was always a but touchy with his workstation". This could mean that Sam might know that Nelson is possibly hiding something and that he wanted to "find out more"
Joanna Q1: "romantically involved", this could mean that she had an "in" with Nelson and his workings and whatever else he was doing because they were close, she could know more, but then also was upset because she feels that she was wrong about their relationship after all...
Joanna Q2: She thinks Sam might've done it, but she's not 100%, that leaves Sam to be a questionable figure
Vince Q1: They were best friends, did everything together and worked the same job all the time.
Vince Q2: Like he said, yes, he would've "trusted him with my life"

Evidence:

Joanna's emails to Nelson: Started out nice but slowly grew frustrated and suspected he was cheating on her but never left him...

Nelson's pills:
After further inspection of the pills and compound C report, it stated that it would gather to a large family of chemicals inside the human body. The chemicals that it Could've linked to was found in Nelson's prescribed allegren medicine. (just a thought) what if he took the pills (which would've allowed him to eat all the peanut butter items) and then proceeded to take the compound C to show that it worked. In theory, the Compound C gathered to chemicals in his body and destroyed them, killing Nelson.
On the other hand, the coroner's report says he died by anaphylaxis by choking, meaning his throat closed up from the peanut allergy. BUT, that means that he was also able to eat the peanut items for an extended time which means that the pills worked for some period of time before "wearing off". What if in theory, he took the allegren pills, took the compound C, ate the peanut butter items, the compound C ate away the active chemicals in the allegren thus taking away the pills use entirely, bringing his allergy back. His throat closes because of the allergy and dies from choking.