Yes, since most applicants are students with little or no credit history, most applicants need one. If you have a qualified1 co-signer, you can't be turned down for credit reasons.
Yes. With a strong co-signer, you're more likely to get fast approval and a check mailed directly to you in as few as 5 business days -- even if you don't have an established credit history, even if you've had credit problems in the past. And a co-signer with excellent credit could lower your loan rates and fees.
Most applicants need a co-signer. As long as your co-signer is qualified, you generally cannot be turned down for credit reasons.2

You do not need a co-signer if you are creditworthy and have all of the following:
International students or applicants that do not meet these requirements will need to apply with a qualified creditworthy U.S. citizen or permanent resident co-signer to be approved.
To help you build your own credit, a co-signer release benefit is available to borrowers who make their first 48 payments on time and who elect to make automated payments.3
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The lender for Gradesaver Student Loans is RBS Citizens, N.A., Member FDIC and Equal Opportunity Lender. RBS Citizens, N.A. may sell your student loan to a third party. RBS Citizens, N.A. will only sell your student loan if the third party agrees to honor all of RBS Citizens, N.A.'s promises to you, including all promised benefits that you will receive or might become eligible for during the loan repayment period.