What size is a bottle of Quell?

One size: .33 fl oz (10 mL). It is the only bottle Quell comes in, so the one you buy first is the same one you would buy again. There is one price for it, too.

Is there a trial size?

No. If you want to try Quell before committing to more, order a single bottle; the buy panel defaults to two, but one is always available. See ordering a single bottle.

How long it lasts

Used as directed, roughly a month, depending on drop size. How long a bottle lasts works through the arithmetic.

Two units on the carton

The carton gives the size in both fluid ounces and milliliters, so you can compare it with whichever unit another product uses. When comparing prices, divide by milliliters, not by bottles, because bottle sizes differ from brand to brand.

Buying more than one

Orders of 3 bottles or more ship free, and below that shipping is a flat $10.00. Spare bottles keep in the same conditions as the one in use: Store between 15° to 30°C (59° to 86°F).