The cost of Life Extension supplements is in the middle, but they are still relatively inexpensive compared to other brands. You can expect to pay between $10 and $30 for a bottle of supplements, and you can even spend as little as $4 for a single bottle, which can contain anywhere from thirty to three hundred capsules. That's pretty affordable for a food supplement brand, but it doesn't come cheap. Moreover, some of these best supplement brands are highly concentrated and maybe too much for some consumers.