The following sounds like a control measurement was taken:
"Blood and urine samples were collected before and after each dose of DHA and at 8 wk after arrest of supplementation."
Also note, that the abstract doesn't say that 200mg is ideal as the science daily description does it says:
"It is concluded that low consumption of DHA could be an effective and nonpharmacological way to protect healthy men from platelet-related cardiovascular events."
Taking measurements before and after the treatment is good, but that is not the same as having a separate control group, which could filter out effects of timing, taking the dose with food or water, etc.
Also note, that the abstract doesn't say that 200mg is ideal as the science daily description does it says:
"It is concluded that low consumption of DHA could be an effective and nonpharmacological way to protect healthy men from platelet-related cardiovascular events."
The abstract also claims "Therefore, supplementation with only 200 mg/d DHA for 2 wk induced an antioxidant effect." It is likely that there was a more complete conclusion in the full article.
I declare this Open Thread open for discussion of Less Wrong topics that have not appeared in recent posts.