Juice only flows in and from pages that are indexable.
- There is no secret squirrel code to change this outcome.
Some people and some sites may suggest to use:
<META NAME="ROBOTS" CONTENT="NOINDEX, FOLLOW">
The follow command used within the meta will only inform Google to follow links to discover new pages, it does not imply to pass juice.
Selectively Select Quality Profiles
If you want to be rewarded then you can selectively enable index on those pages that are considered high quality.
Not all links are born equal
You should also note that even if the profile page is considered unique content, the backlinks created for this page may have a:
- Big Effect
- Some Effect
- Negative Effect
- Little Effect
- No Effect
Due to the high volume of backlink abuse over the years Google has fine tuned what type of links it rewards, some links may help the site, some may not at all. If the site has too many incoming backlinks that are not relevant to the topic of the site then you should expect this to work in a negative way.
For example, if your site is about IT hardware reviews, and you have one user profile with a 100 backlinks from various sites about animals and cats, then you should expect that to either have no effect, or a negative effect.