If you do not want to take any chemicals to improve your lash length, you can use some herbal remedies. Vitamin E is known to improve all around hair growth. It stimulates the roots of the hair and helps them grow in stronger and longer. There are companies that bottle vitamin E with special applicators so that you can apply the vitamin E oil to the base of your eyelashes. It will typically take a few weeks, about 4-5 weeks, to see any results.
The vitamin E will be absorbed through your eyelids and into the eyelash roots. On the next growth cycle, your lashes should come in longer. Vitamin E can also be taken in daily supplements but the results will not be targeted at your lashes, but will be spread throughout your body.
If you want immediate results for longer lashes, then your best alternative is to use fake ones. You can apply the fake lashes yourself. There are some positive things to fake lashes. The results are immediate, you can choose the length, and if you don't like them you can simply take them off. The fake lashes are not a permanent answer so you could use them while your lashes grow in longer naturally form either products like Bimatoprost or vitamin E.