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. Author manuscript; available in PMC: 2016 Sep 2.
Published in final edited form as: Environ Res. 2015 Oct;142:542–548. doi: 10.1016/j.envres.2015.08.005

Table 3.

Supplement usage and consumption of certain foods by study participants

Percent (n)
How often do you take, eat or drink the following items? Daily 2–6 times/week Once/week 1–3 times/month Rarely or never
Supplements
Fish oil 27.9 (43) 5.8 (9) 3.3 (5) 3.3 (5) 59.7 (92)
Flaxseed oil 3.9 (6) 1.3 (2) 1.3 (2) 1.3 (2) 92.2 (142)
Cod liver oil 1.3 (2) 0 (0) 0.7 (1) 0.7 (1) 97.4 (149)
Any supplement that includes omega-3 fatty acids 17.5 (27) 3.3 (5) 2.6 (4) 3.3 (5) 73.4 (113)
Selenium supplement or multi-vitamin with Selenium added 20.8 (32) 2.0 (3) 0.7 (1) 0.7 (1) 76.0 (117)
Vitamin D supplement or multi-vitamin with Vitamin D included 44.8 (69) 6.5 (10) 4.6 (7) 5.8 (9) 38.3 (59)
Food and Beverage Items
Omega-3 fortified food or drink such as orange juice, milk or eggs fortified with omega-3 fatty acids 9.1 (14) 7.8 (12) 7.8 (12) 11.7 (18) 63.6 (98)
Vitamin D fortified milk 32.5 (50) 24.7 (38) 7.1 (11) 5.8 (9) 29.9 (46)
Vitamin D fortified food or drink (NOT including Vitamin D fortified milk) such as orange juice, cereal or yogurt fortified with Vitamin D 10.4 (16) 18.8 (29) 14.3 (22) 14.9 (23) 41.6 (64)