The phrase "actually a source of" is correct and usable in written English.
It can be used to clarify or emphasize that something serves as a source or origin of a particular idea, information, or phenomenon.
Example: "The research findings are actually a source of new insights into climate change."
Alternatives: "truly a source of" or "indeed a source of".
The huge number of unemployed workers is actually a source of wealth.
The paradox lies in the argument that claiming unity against oppression is actually a source of oppression in itself.
Your editorial assumes that an extended presence will deliver the West from terrorism, but NATO troops are actually a source of frustration and terrorism.
"It is also possible that really old trees could be so damaged by this fungus that they are actually completely hollowed out and no longer actually a source of methane at all, because the anaerobic conditions required for methanogens would no longer exist," he added.
Avatars are actually a source of revenue for mig33, by charging users to customize and enhance their avatars.
Delving into this subject, and determined to search beyond the usual explanations, I found that three powerful elements demonstrate that immigration is actually a source of wealth and innovation in Silicon Valley.
Could it actually be a source of distraction, with the system ending up causing more problems than it actually proposes to solve?
Sadly despite its best intentions the medicalisation of education actually becomes a source of further emotional disorientation and distress.
I'm glad that the texts can actually be a source of solace — reading should serve that purpose as well as many others.
They can't believe that these things which are so basic and so known can actually be a source of performance differentials.
In the fruit fly experiment, results showed that most fruit flies don't thrive on lactose as they would glucose, suggesting that lactose may actually be a source of toxicity, according to Lisboa.
