Breast vitamin tablets

I found the vitamin tablets that I bought when I had not long started breastfeeding yesterday, they are still in date. I was wondering if I was to take them again would they help in increasing milk supply? As I am struggling with my supply recently and my little girl has become very fussy. She wont latch onto me Much anymore and when I’m hand expressing them getting hardly anything out. I do have an electric pump but it is broken and I can’t find a replacement. I think the brand has been discontinued and I don’t have the money to buy another pump really, although I have seen that getting a double pump and pumping both boobs at the same time they help increase my milk supply but as I say I can’t find any cheap double pumps I’m really struggling. I want to try and get my milk up so that I’m able to make it till at least just over one year which was my goal of her having breastmilk even if it is put in with formula. What can I do? I already drink water and have a balanced diet. I know around this age they don’t really need much milk but as I say I don’t want to be using formula really, obviously I have been using it a little bit and I have nothing against formula I just feel sad that I wasn’t able to reach my goal of 12 months.