Look at the label on your nicotine bottle. Regular (also called freebase) is the usual kind, and most bottles are this one. SALTS bottles say "salt" or "nic salt" on the label. They feel smoother, so people use a higher number. UK nic shots are small 10 mL bottles at 20 mg/mL — common in the UK and Europe. If you don't add nicotine at all, pick None.

It's printed on your nicotine bottle as mg/mL (sometimes written "mg/ml" or just "mg"). 100 mg/mL is the one we recommend: it is the safest to handle and the easiest to measure. Stronger bases (like 250) need very small amounts, so a pipettor really helps. If your number isn't here, pick Other and type it in.

mg/mL is how much nicotine ends up in each mL of your finished bottle. Lower is lighter, higher is stronger. For regular nicotine, 3 and 6 are the most popular. SALTS are usually mixed stronger, like 12 or 22. Not sure? Start lower — you can always make the next bottle stronger.

The carrier is the plain liquid that fills up the rest of your bottle: PG (propylene glycol), VG (vegetable glycerin), or a mix of both. The numbers are the PG/VG split — 30/70 means 30% PG and 70% VG. The chart doesn't change much with the ratio; it just prints your choice on the page so your recipe is written down. Tip: the flavor blends are VG-based, so add a little more PG than your usual ratio.