Final answer:
The side effects of ginkgo biloba include headache, dizziness, and upset stomach, meaning all of the listed side effects are possible.
Step-by-step explanation:
The side effects of the non-nutritive supplement ginkgo biloba can indeed include headache, dizziness, and an upset stomach. Hence, the correct answer for the question would be '4) All of the above'. It is important to note that herbal supplements can cause side effects just like any other medication, and they can also interact with prescription medicines. People using ginkgo biloba, just like those consuming any other supplement, should be aware of the potential side effects and monitor for any adverse reactions that might arise during use.