Castor oil has long been touted in the West Indies as a miraculous natural hair restorative product. You will come across some woman in Jamaica or Haiti who has used this oil at least once in her lifetime. Reports of thicker and longer hair have been mostly anecdotal with no actual scientific data to back up claims. With so many persons claiming that it works, does it truly have the potential to actually grow hair? Let’s look into the properties of this oil.
How is castor oil made?
Castor oil is derived from roasting or cold pressing the castor bean. The colour of castor oil is actually pale to golden yellow. This is what you will find in products that are made from cold pressed oil. The traditional method of preparing the oil results in a much darker product. This arises because the beans are roasted then pounded before boiling. The ash produced in the process darkens the final product.
What are the properties of castor oil?
Castor oil is comprised of the fatty acids ricinoleic acid (~97%), with linoleic acid and oleic acid. Ricinoleic acid has several properties with the most notorious one being a laxative. Countless Jamaican children can attest to “de-worming” with this oil. It stimulates the E2 and the E3 prostaglandin* receptors**. The latter are in the intestines and the uterus. It therefore increases the motility of these organs. This is why pregnant women are not recommended to ingest or use the oil as it reportedly can induce labour. Studies done haven’t definitively proven this, however, it is used by many for this purpose around the world.
So, can castor oil really grow hair?
The E2 prostaglandin receptors are present in several areas of the body, including the hair follicle. Could this be the reason for castor oil’s reputed effects on hair growth? This has never been extensively studied by scientists. Prostamide, (prostaglandin-ethanolamide) receptor stimulants, like bitmatoprost (Latisse) and lantanoprost- used for glaucoma, have been found to grow hair as a side effect. Could castor oil have some cross effect on these prostamide receptors as well? After all, the prostaglandin and prostamide receptors are somewhat similar in shape. Their activity on these newly discovered receptors has never been determined.
Castor oil has reportedly been reported to not only grow hair but also to thicken the hair strand. This is not impossible since Minoxidil has also been found to thicken vellus (thin baby-like hair) to thicker terminal hairs; however, the actual Mechanism of Action of Minoxidil is still not known. So are those “before and after” pictures really true? Considering that the actual hair counts and hair fibre determinations have not been done, then from a scientific point of view, it could be pure coincidence. After all, lots of persons experiencing hair loss also take vitamins and utilise many different methods which may rectify their hair loss WITHOUT the help of the castor oil.
Is castor oil all hype?
There is absolutely no way to tell from the available information if it is truly all hype. The placebo effect is a real phenomenon. There are persons who will experience positive effects even though the entity they are using actually isn’t doing anything to help their ailment. However, so many persons have given such glowing reports on the effects of castor oil, that you do have to wonder that it really does what people say. In any case, it doesn’t hurt to use castor oil as it is a really great emollient and has significant cosmetic effects on the hair. Here are some easy ways you can add it to your routine:
- Add it to your deep conditioner
- Make a pre-shampoo treatment mixing it half and half with honey
- Use it daily as a sealing oil on top of your regular leave-in-conditioner
- Hot oil treatment
*prostaglandins are locally produced hormones in the body, i.e. they are not influenced by the hypothalamus in the brain. They are mostly responsible for setting up the body’s response to external injuries. Read up on prostaglandins here: http://www.yourhormones.info/hormones/prostaglandins.aspx
**receptors are complex structures present on the cell membranes, (the wall which holds in the contents of all cells). When stimulated by certain hormones, they can increase or decrease specific activities in the cells.
