Have you been told that mayonnaise is a great conditioner for your hair? How about making your own sugar scrub for your face, or egg white for a facial mask. I read that glue spread onto your face is good as a face mask.
Now for the facts. Science has spent years and millions to find the best products for our hair and skin. There are many inexpensive products that work wonderfully. Food is to be eaten, not smeared on our face and in our hair. Forget it.
Get recommendations from your friends or the Internet to find what you might like too. You can read reviews on Amazon for cosmetics to see what might meet your needs.
I hold to one exception; baking soda. I know it does many unconventional things, so you can experiment.
As for sugar scrubs; not for me! I tried it once, and my hairline was sticky, as well as behind my ears, and around the sink. Leave the sugar in the kitchen, and read reviews for store bought scrubs that are even better.
Editor's Note: This is certainly a debatable argument. Tell us whether you agree or disagree in the feedback.
You must have had some horrible concoctions you've tried, to say making your own beauty products is a waste; it's so wrong. I dislike all the chemicals that are in the commercial creams, soaps, etc.
Health and beauty items that you don't use or want to use for their intended purpose can often be put to a different use such as using lotions for shaving. If unopened they could be donated to a shelter. This is a page about using it up health and beauty products.
When you have sunscreen that is past it's 'use by' date, you should not use it to protect your skin from the sun. It could possibly be useful as a lotion, if you are certain there is no bacteria present.