Children all develop at different paces and exposure to language is important. We have always read books together, sung songs together and played a variety of fun and age appropriate board games and memory games. We model the use of language when out and shopping and when doing anything outside of the house. Children do learn from adults, children and from lots of exposure to language.

Children talk in their own time. My experience was daughter spoke waaaay early than son. Try Miss Moni on YouTube this made a huge difference for him.

I think you are doing all the right things. Have you considered turning it into some sort of game or perhaps even a reward charts this might help encourage your child to try more otherwise the idea of being around other toddlers who are telling will most definitely help as kids want to do what other kids are doing.

Our kids develop in their own pace. I remember when my son was 2 years old he only spoke about 5 words… The community nurse fussed about it and wrote a referral for speech therapy. I attended a couple of sessions but really was not too worried and then discontinued. Once he started talking he was unstoppable. In the meantime it can be helpful to teach your toddler some basic signs so they can express their needs and wants. Keep up the reading and modelling. Attending play groups or child care can help too 🙂

One thing to keep in mind, stages not ages. If a toddler gets to two and says nothing at all, then you can reach out to GPs for speechie referrals. You only need vitamins if they aren’t eating well and lack the nutrition.
A few things that I found encouraged talking was getting some educational posters from Officeworks and placing them around the change table. I have one with farm animals that show what sound they make. When he points I would say the animal and the sound. Now he does it. At Kmart there is a pack of posters for a few dollars with fruits, veggies, shapes, colours, days and months. I have them stuck along the kitchen bench and fridge. He would run over and point, I would tell him what it is. Now he will tell me when I ask where they are and points at them. Flash cards. Keep reading and rotating the books. Talk throughout the day. Pointing out body parts at bathtime and regularly asking where they are. Just by telling him I was drying his belly button be learnt the word and where it is. Just before 18 months he started learning a word a day, before that it was maybe 30. Suddenly their language just explodes.