Decsi 2005.

Methods	This is a placebo‐controlled, randomised, double‐blind trial on expecting mothers living in Germany, Hungary and Spain.
Participants	Expectant women from the 20th week of gestation (n = 312).
Interventions	Women received either: Group A: 500 mg Docosahexaenoic Acid (DHA) (n = 77) Group B: or 400 mg Methyltetrahydofolate (5‐MTHF) (n = 80) Group C: or placebo (n = 80) Group D: or the combination of 500 mg DHA and 400 mg 5‐MTHF (n = 75).
Outcomes	Contribution of docosahexaenoic acid (DHA) to the fatty acids of erythrocyte phophatidylcholine (PC) and phosphatidylethanolamine (PE) lipids at delivery (n = 312).
Notes	For this review, we compared group B with group C. and group A with group D.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "....randomized,..." Comment: insufficient information to permit judgment.
Allocation concealment (selection bias)	Unclear risk	Insufficient information to permit judgment.
Blinding (performance bias and detection bias) All outcomes	Low risk	Quote: "....double blind,..."
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information to permit judgment.
Selective reporting (reporting bias)	Unclear risk	Insufficient information to permit judgment.
Other bias	Unclear risk	No other bias identified but insufficient information available to fully assess this 'Risk of bias' domain.