“People aged 50 or older should take a multivitamin that contains B-12. B-12 supplements normally pack the vitamin in crystalline form, which is important because older adults often have a reduced ability to absorb B-12 in other forms. In addition, older adults who get insufficient exposure to sunlight should include multivitamins with vitamin D in their diet.
Manufacturers of private label nutritional supplements like Bactolac Pharmaceutical Inc. can help address the needs of these people, among other groups with specific dietary requirements. Companies looking to develop any such formula for supplements or looking to have an existing formula manufactured may turn to these pharmaceutical companies for services ranging from formula development to packaging and shipping.”
https://bactolac.wordpress.com/2013/11/27/private-label-nutraceuticals-addressing-vitamin-deficiency-problems/
Bactolac Pharmaceutical, Inc 