Comparison

Alpine Custom Complete with Iron and Basic Preventive 3 (Plus Iron)

Alpine Custom Complete with Iron (Alpine Clinic) lists 30 distinct ingredients and Basic Preventive 3 (Plus Iron) (Douglas Laboratories) 30 (rows of one ingredient counted once); 29 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 0.91.

Amount per serving (and % of the Daily Value)
IngredientAlpine Custom Complete with IronBasic Preventive 3 (Plus Iron)
Vitamin C1,200 mg (1333%)1,200 mg (1333%)
Calcium500 mg (38%)500 mg (38%)
Vitamin B650 mg (2941%)50 mg (2941%)
Vitamin D25 mcg (125%)2.5 mcg (13%)
Magnesium500 mg (119%)500 mg (119%)
Vitamin B12200 mcg (8333%)100 mcg (4167%)
Zinc15 mg (136%)20 mg (182%)
Niacin200 mg (1250%)200 mg (1250%)
Vitamin E400 IU400 IU
Potassium99 mg (2%)99 mg (2%)
Folate800 mcg800 mcg
Vitamin A15,000 IU25,000 IU
Pantothenic Acid (Vitamin B5)400 mg (8000%)400 mg (8000%)
Riboflavin50 mg (3846%)50 mg (3846%)
Thiamin100 mg (8333%)100 mg (8333%)
Biotin300 mcg (1000%)300 mcg (1000%)
Iron20 mg (111%)20 mg (111%)
Chromium200 mcg (571%)200 mcg (571%)
Selenium200 mcg (364%)200 mcg (364%)
Manganese10 mg (435%)20 mg (870%)
Iodine150 mcg (100%)150 mcg (100%)
Choline150 mg (27%)150 mg (27%)
Vitamin K100 mcg (83%)60 mcg (50%)
Molybdenum150 mcg (333%)150 mcg (333%)
Inositol50 mg50 mg
Boron3 mg2 mg
Flavonoid100 mg100 mg
Vanadium100 mcg39 mcg
PABA50 mg50 mg
Copper2 mg (222%)
Hesperidin15 mg

Amounts are per serving as DSLD gives them: Alpine Custom Complete with Iron, 6 tablets; Basic Preventive 3 (Plus Iron), 6 tablets. Current labels entered May 2017 and February 2017. Percentages of the Daily Value from 21 CFR 101.9. Source: NIH ODS Dietary Supplement Label Database.

Each product on its own