If you’re looking for health websites that allow for blog comments, I suggest looking at your top competitors and checking if they allow for comments.
Keep in mind that blog comments are usually no follow.
This means that they’re not going to help you all that much.
Still, blog comments can help you if you use them the right way.
How?
Place a lot of comments on high-value sites in your niche.
Keep this up for a long time.
Build credibility
If you notice that a lot of your comments are actually being replied to by the site owner or site administrator, this means that they think you’re legit.
Keep this up for some time and, then, ask them for a guest post or if they’d like to collaborate on some research with you.
That’s how you play the game because the comment section in of itself is not going to help you in terms of your link profile.
The payoff is when you establish a relationship based on the credibility and authority of your comments so these websites actually start linking to you.
That’s how you play the game.
Otherwise, blog comments—especially automated comments—are just a waste of time.