Comparison

Basic Preventive 4 (Iron and Copper Free) and Basic Preventive 5 (Iron Free)

Basic Preventive 4 (Iron and Copper Free) (Douglas Laboratories) lists 28 distinct ingredients and Basic Preventive 5 (Iron Free) (Douglas Laboratories) 29 (rows of one ingredient counted once); 28 are on both labels. On the site's similarity measure, which compares ingredient lists (1 for the same list, rarer ingredients counting for more; amounts are not part of it), the two formulas score 0.96.

Amount per serving (and % of the Daily Value)
IngredientBasic Preventive 4 (Iron and Copper Free)Basic Preventive 5 (Iron Free)
Vitamin C1,200 mg (1333%)535 mg (594%)
Calcium500 mg (38%)220 mg (17%)
Vitamin B650 mg (2941%)22 mg (1294%)
Vitamin D2.5 mcg (13%)1.1 mcg (6%)
Magnesium500 mg (119%)220 mg (52%)
Vitamin B12100 mcg (4167%)44 mcg (1833%)
Zinc20 mg (182%)9 mg (82%)
Niacin200 mg (1250%)85 mg (531%)
Vitamin E268 mg (1787%)119 mg (793%)
Potassium99 mg (2%)44 mg (under 1%)
Folate1,333 mcg DFE (333%)592 mcg DFE (148%)
Vitamin A7.5 mg3.33 mg
Pantothenic Acid (Vitamin B5)400 mg (8000%)178 mg (3560%)
Riboflavin50 mg (3846%)20 mg (1538%)
Thiamin100 mg (8333%)44 mg (3667%)
Biotin300 mcg (1000%)133 mcg (443%)
Chromium200 mcg (571%)85 mcg (243%)
Selenium200 mcg (364%)90 mcg (164%)
Manganese20 mg (870%)9 mg (391%)
Iodine150 mcg (100%)70 mcg (47%)
Choline150 mg (27%)65 mg (12%)
Vitamin K60 mcg (50%)27 mcg (23%)
Molybdenum150 mcg (333%)65 mcg (144%)
Inositol50 mg22 mg
Boron2 mg0.9 mg
Flavonoid100 mg44 mg
Vanadium39 mcg18 mcg
PABA50 mg20 mg
Copper0.8 mg (89%)

Amounts are per serving as DSLD gives them: Basic Preventive 4 (Iron and Copper Free), 6 tablets; Basic Preventive 5 (Iron Free), 4 vegetarian capsules. Current labels entered August 2020 and February 2021. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own