Hi, I am a copywriter and I have experience with writing marketing emails. I can write good headlines for your eCommerce health and beauty website.
The most important reason someone opens up an email is when the headline tells them that they'll the email contains something that's important or beneficial for them. This means, when you are sending out an email to to have to write a headline that lures them in with the promise that reading the email will give them some sort of benefit.
So, if you are writing an email to market fish oil supplements, a good headline will be "this supplement will increase your brain function by 200%".
Every email should have a headline tailored to what's written in the email. I can suggest you some headlines if you can tell me what type of products you want to market. Can you talk to me over the chat and give me more info?