How a 21-year-old Instagram star who makes $10,000 a month spends his money in a typical week

• For Business Insider's " Real Money " series, Andrew Kozlovski, a 21-year-old student at the University of Southern California, shares a week of spending in Los Angeles, California.
• Kozlovski runs his own business, which generates $6,000 to $10,000 a month, primarily driven by marketing on Instagram.
• He usually eats at home and rarely parties, but this week he spent a lot of money on Ubers to capture social media content.

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Andrew Kozlovski, a 21-year-old student at the University of Southern California, told Business Insider that his mother imparted on him a piece of financial wisdom that has been key to his success.

Worry less about saving money, she said, and focus on how to make more money.

Kozlovski took that advice to heart, starting a business at 19 selling nootropic supplements, primarily by marketing on social media.

Kozlovski built a social-media following selling a supplement called Brainz Power. Today, he has nearly a dozen accounts - with followers in the hundreds of thousands - where he posts aspirational content for budding entrepreneurs.

As a star swimmer in high school, Kozlovski had taken all kinds of natural supplements, so he started compiling a list of those said to boost cognitive performance. Then he found a lab near his hometown of Atlanta that was licensed by the Food and Drug Administration and willing to run a small order of pills combining the various supplements; he'd pay using the $500 he had saved up over the year.

While supplements are legal and many people swear by their effects, evidence about their benefits are murky , and US poison-control centers have received about 275,000 reports of people reacting badly to them over the past two decades. The supplements industry, estimated to be worth as much as $37 billion a year , is not regulated by the FDA.

Brainz Power generates around $6,000 to $10,000 per month, depending on sales. But that hardly means Kozlovski is balling out. He uses what he needs to pay his yearly living expenses and tuition to USC and invests the rest back into the business.

Outside of rent and tuition, Kozlovski's biggest expenses are equipment and transportation to create promotional content for Brainz Power.

Here's a closer look at what he spent over the course of a recent week: