Help with increasing milk supply

[Warney]

I have been back at work now for over a month and have managed to continue feeding my daughter myself apart from one bottle of formula a day. My normal routine is as follows

Feed and express first thing in the morning, my daughter has a formula feed at lunchtime, the mile I've expressed at tea time and I give her a night feed.

However my milk supply has redusing steadily, how can I increase it, are there any vitamins that I can take that will assist as I really want to continue with breastfed milk for as long as possible, well at least until my daughter is 1 years old (she's currently 8 months).

Any help/advise would be much appreciated

Can you express more often as that will stimulate more milk?

Expressing more and makign sure you are drinking and eating well, also fennel tea is supposed to help

Could you not try and express at lunchtime for example as well as tea time? First thing in the morning is the best time as I am sure you know but the stimulation should still help?