The scanner will help you assess anti-oxidant levels and track changes to see if your multivitamin supplement and dietary changes improve your anti-oxidant levels.
If you do not take any supplement before being scanned, then you decided to start to take one type of vitamin after the scanning, you can very well see if your skin carotenoid score (SCS) has improved.
OR
You may take the test while consuming one type of supplement now and check how it is actually protecting your body. If your SCS level is still low after a month, you may shift to another type of supplement to see the difference.
I believe you may also use this to check whether the over the counter vitamin supplement is just as good as the more expensive ones...or not...
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It is best to make an educated move, than to just go with the flow or make a wild guess...