Since the Egyptians discovered that they could cure night blindness (caused by Vitamin A deficiency) by feeding the patient liver, proper intake of vitamins has been recognized to be part of a healthy diet. Unfortunately, many modern diets are extremely processed or refined, and so most people need to amplify their meals with some kind of multivitamin supplement.
For literally years I tried to be good and take my vitamins every day, and I managed perhaps one a week at most. It was incredibly frustrating because until recently I worked every day with a lot of children, and my immune system was starting to show signs of strain. In 2009 I had the flu for a week or more three times within a six month period! Yet I still continued to stubbornly try to take supplements in a way that was clearly not working for me.
About three months ago, my mom mentioned that my grandmother was taking liquid vitamins, and asked if I wanted to try them. To make a long story short, I now pour a small packet in my orange juice every day. I haven't missed more than a day yet, and I feel fantastic!
I am definitely not a doctor, and I urge you to consult yours to figure out what vitamins and supplements your body needs. Many companies will claim that liquid vitamins are WAY better for you than pills, but the truth is that research shows that what really makes the difference is quality. A high quality vitamin of either type is better than a low quality one. What I am advocating, however, is mixing it up! Albert Einstein popularly defined insanity as "doing the same thing over and over again and expecting different results." So if you aren't having any luck with your daily multivitamins, mix it up and try liquid! It may be just what the doctor ordered.
(The photo above is of the brand of vitamins I use; however I am not affiliated with them in any way; nor am I qualified to prescribe or recommend particular dietary supplements! Please talk to your primary care physician about your needs.)