White hat backlink building

I second the guest blogging. It's best to find related blogs with similar topics and provide them with a choice of one article topic or another. Sometimes it's tough to find a contact, but many sites have twitter and stuff.
 
After new google updates, creating natural links is the best option to rank your website.
 
Share high-quality relevant content on your niche and create links with pharma sites, you can also use HARO and try to reach out to genuine websites for guest posts, link roundup will also help, it's all about the relevancy these days, so try creating maximum blogs with links.
 
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