The aim of the present study was to determine the phenolics, carotenoids, B-vitamins,
and antioxidant activity of nuts and seeds grown in Vietnam. The concentrations of carotenoids
and B-vitamins may vary among the nuts and seeds. Watermelon seed contained the highest level
of lutein while pumpkin seed was the -carotene richest sample. Sachi inchi and sunflower seed
comprised considerable levels of vitamin B1, B6, and B9. The phenolic analysis revealed that cashew
contained the highest total amount of flavonoids (466.04 g/g), with catechin, epicatechin, and
procyanidin B2 predominating over the other flavonoids. Likewise, chlorogenic and neochlorogenic
acids made up the highest total amount of phenolic acids in sunflower seed (1870.41 g/g). Walnut
appeared to possess the highest antioxidant activity evaluated by DPPH, ABTS, FRAP, and reducing
power assays. The correlation analysis indicated strong positive correlations between total phenolic
content with DPPH and FRAP values. Principal component analysis graphically showed the distant
positioning of cashew and sunflower seed, highlighting their significantly higher levels of phenolics.
The findings of the study would be useful to improve nutrient database contents for flavonoids and
phenolic acids as well as to promote the consumption of nut and seed products in Vietnam.