I am a registered member of a food supplements company.
I would go about this by finding influencers. What does your target customer look like? Then identify who they look up to, are fans of and follow up on the advice of.
Approach those influencers you highlight. They may be happy to promote your product against payment, or if it really fits in with what they stand for, then they may be happy to work on a product basis only.
If you want to maximize the customers you already have to market your goods, then I would suggest a rewards program which works with referrals. Check out sloyalty.com, they have a solution which starts out free too.
This is very tricky, as many countries participate in the Eurozone food requirements or other equally oddball rule sets.
Your first step will be to pick a jurisdiction, like Europe + then ensure your ingredients list matches their rule set.
If for example, you have Kava Kava on your label, you won't be able to ship to England or any EU country.
Start with this first.
Then generate content (YouTube + blog), related to uses for your product.
This will be a long haul venture.
Having done this myself before, you'll invest years (plan on at least 10 years) + have a 7-8 figure business.
This all imagines you control the entire ingredient acquisition + manufacturing chain.
I'm unsure what you mean by registered member of a company. If this means you're working with an MLM or other company where you have no say in the supply chain...
Don't even start.
You'll invest a huge amount of time + to many things can go wrong, if anyone else is controlling any part of this process.