Summarize this article in one sentence.
There are a number of rumored natural products that can help thicken hair, but the most consistently cited is aloe vera, which is believed to help seal in natural moisture and promote hair growth. To use aloe vera, apply an aloe vera gel (available at most drug stores) to your scalp, let it sit for 30 to 60 minutes, then shampoo as usual. You can even extract the gel straight from the aloe leaf. Another of the most frequently recommended options, castor oil contains fatty acids, vitamin E, and ricinoleic acid, which are believed to nurture your hair and scalp. To use, apply several tablespoons of castor oil to your scalp and massage in. Be sure to choose an oil that is hexane-free. Repeat the process multiple times a week. Apple cider vinegar is believed to both balance your scalp’s pH and provide it with beneficial nutrients.  As a bonus, because the vinegar will remove residue from your hair, it can also boost volume and soften hair.  After washing your hair, pour about 1/2 cup of apple cider vinegar over your hair and then rinse. There are several vitamin supplements believed to help enhance hair growth. For more information, start with this list from WebMD. Unfortunately, there isn’t yet a strong body of scientific evidence to support the effectiveness of vitamins for hair loss, so remember that it may not be realistic to expect a miracle solution.

Summary:
Try aloe vera. Apply castor oil. Rinse with apple cider vinegar. Take vitamins.