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You can buy aloe vera plants online or at a local greenhouse. To extract the gel, slice the plant straight down the middle of the leaf. Move the knife slowly to avoid slipping up and accidentally cutting yourself. Make sure to use a sharp knife, as it can be difficult to make a clean cut with a dull blade. Use a tablespoon to extract two tablespoons of aloe vera gel. Aim for the clear gel inside the leaf. There will be some yellowish gel near either end of the leaf. Do not gather this gel as you should only use clear aloe vera gel on your hair. Place the gel in a small container you can set in the shower, like a Tupperware container. Depending on the size of your plant, you may be able to get enough aloe vera gel from one leaf. However, if your plant is smaller, you may have to collect gel from another leaf until you have two tablespoons. When you shower, you can apply the gel when you would normally apply your conditioner. Work it into your hair, moving from the roots to the tips. Use it exactly how you would use your normal conditioner. For example, if you normally let conditioner sit in for a few minutes in the shower, do so. After apply the gel to your hair, rinse it out. Make sure to get all the gel out of your, especially the sticky bits. If you have a hair type that responds to aloe vera gel, your hair should be noticeably softer.

Summary:
Slice an aloe vera leaf. Remove the gel. Apply the gel in the shower. Rinse out the gel.