20MG Reta mix with 100 units of bac water.

20 mg Reta + 100 units bacteriostatic water

• Start with: 20 mg powder

• Add: 100 units bac water

• 100 insulin units = 1 mL

After mixing:

• Total liquid in vial = 1 mL

• Total peptide = 20 mg

So imagine the vial as:

20 mg spread evenly through 100 units

That means:

• Every 10 units of liquid contains 2 mg

• Every 50 units contains 10 mg

• Every 100 units contains 20 mg (the whole vial)