Prime Health Direct sell 20mg tablets for £14.99 (180 tablets). I have taken these for a number of years and found them to be effective. They are competitively priced, but often they run out of stock, so can be unreliable.
WITHDRAWN Natural Health Practice used to sell it as a food supplement of the whole herb (in capsule) 200mg called Agnus Castus Support, but the MHRA have recently banned them from doing so.
A. Vogel Tincture: I haven’t tried this, but others report success. The dosage does seems to be lower –
20 drops of A.Vogel Agnus castus tincture contains 54.2mg of dried fruit, or 542mg of extract (which is the fruit once it’s been macerated in a water/alcohol mix and extracted). So if you take a daily dose of 40 drops you get 108mg of dried fruit or 1,084mg of extract.
– but it is certainly an alternative to tablets/ capsules. The product has a lot of positive reviews.
All three companies I have linked to above spent time answering my questions and were more than happy to talk about their product and what the dosage actually means.