The most common mistake with the BBC Unit is dosage. Preservatives work by percentage. If a preservative requires of the total formula weight, you calculate:

| Measurement | Volume Equivalent | When to use it | | :--- | :--- | :--- | | | 0.05 mL (approx) | DIY face cream (50ml batch) | | 1 Standard Drop (Water) | 0.05 mL | Exactly the same as BBC unit | | 1 Standard Drop (Glycerin) | 0.08 mL | Thicker liquids require fewer drops | | 1 Milliliter | 20 BBC Units | Small lab samples | | 1 Teaspoon | ~98 BBC Units | Large body butter batches |

Members of the BBC Unit undergo rigorous training to prepare them for their roles. The training program includes:

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