Are all supplements created equally? In the supplement market it quite often holds true that ‘you get what you pay for’. There are ways to make supplements cost less; use poor quality raw materials, press them into a tablet (greatly increases productivity), and/or pack remaining space with cheap ‘filler’ (often corn, soy, wheat, sugar).
A few items to note:
Vitamin C is most often sourced from corn, a common allergen. I actually have a client who thought she was allergic to vitamin C because she had been trying supplements for many years and always reacted to them. I had her try a high-quality blend that was not from corn... and she tolerates it with no problem.
Vitamin B12 is a thick sticky substance and is consequently mixed with lactose (a milk sugar) to make it easier to blend evenly into a multivitamin mixture.
Beta-carotene and Vitamin E are often created synthetically in a lab; your body does not recognize synthetic vitamins as well as it does natural-source supplements. Vitamin E oil is often mixed with soy oil, a common allergen.
Many bottles will list ‘No added corn, soy, wheat, yeast, sugar’; be aware that this is different from ‘Contains no corn, soy, wheat, yeast, sugar’. The former may have it in their raw materials, already added (such as the B12).
Then there is also the issue of whether the supplement will dissolve in adequate time. Tablets can be difficult to breakdown and consequently lead to expensive bowel movements. Choose capsules in place of tablets, when possible. Although a smaller quantity of nutrients can fit into a capsule (vs. tablet) this is quite useful as our body can only absorb so much at one time (eg. you can only absorb ~500mg calcium at once). Taking a capsule supplement a few times throughout the day will actually improve our absorption of the nutrients within them, as opposed to one big tablet daily.
High quality supplements free of common allergens and blended for optimal absorption are available directly from most health practitioners.