I don't want to hijack this thread but I want to make a couple of points clear as they might help Roee. Or they might not.
I just want to make sure I don't miss any vital nutrients. My diet is usually very poor. For decades I have often gone for long periods where my only food is bread/toast with tahini, raisins and nuts, tea and soya milk, and perhaps one or two apples a day. The occasional banana. Perhaps a cooked meal with some green veg, carrots and potatoes once a week. Sometimes twice a week. Sometimes no cooked meal for two weeks. More recently, I've been having cooked tomatoes on toast with olive oil once or twice a week as part of my cooked meals.
I doubt if I have a regular adequate supply of beta carotene or pro-vitamin A in my unsupplemented diet. My vitamin C intake could be on the low side at times without tablets. I also have no preformed source of DHA or EPA but obviously manage to convert enough for my needs as I am very healthy. I am thinking of getting some algae capsules. Just thinking.
I need a supplement for vitamin D because, due to a back injury and my lifestyle, I hardly get any sunlight. Consequently, I am rather pale-looking. No, I'm not a vampire.
I am also concerned that the fruit and vegetables I eat might have been picked many days or even weeks before I get my hands on them.
Despite all this, I am extremely healthy, full of energy and strong. I think my supplements help me to remain so as my diet isn't really always adequate.
Some studies have found the benefits of taking supplements. Some haven't. It might depend on the study design or the starting levels of nutrients in the subjects. Some of those that found benefit were partly funded by vitamin sellers, but not many other private organisations would fund such studies.
It's not always easy to know if the results of a study are accurate. Even the reviewers in journals have to rely on the data supplied by the authors - which could be wrong. We have to decide if we believe the authors just as we have to decide if we believe other authors who said things to the contrary. I often contend that the only way to know if a study's results are accurate is to do the study yourself. I can't conduct medical studies, so I need to decide which studies to believe.