By Jc of The Nat­u­ral Haven Bloom

So let us take a straw poll. How many of you have heard that cas­tor oil can help improve the thick­ness of nat­u­ral hair? I have seen this said many times, and since hair thick­ness is dic­tat­ed by genet­ics, I have always won­dered if there was any truth to the state­ment. I final­ly decid­ed to research it.

First question — what is in castor oil?

Like many nat­u­ral oils (coconut oil, shea but­ter, olive oil etc), cas­tor oil is com­posed of sev­er­al fat­ty acids. In real­i­ty, the­se acids are bound and there­fore do not real­ly behave like acids at all (note that you can­not pH an oil as it does not dis­solve in water). The dom­i­nant fat­ty acid in cas­tor oil is rici­nole­ic acid.

Can ricinoleic acid or any other of the fatty acids in castor oil increase hair thickness?

There are no sci­en­tific stud­ies to prove that cas­tor oil can increase hair thick­ness. Inter­est­ing­ly, in the field of male pat­tern bald­ness where hair thick­ness improve­ment is a major require­ment, cas­tor oil does not even fea­ture as a research ingre­di­ent.

What about the pictures where naturals show an improvement in hairline/bald patches by rubbing castor oil?

In my opin­ion this is not evi­dence because mas­sag­ing in itself even with plain water can stim­u­late regrowth of hair (i.e where hair has fal­l­en out or been pulled out, mas­sage can help a new strand to grow back). I would add though that the study that showed this was done in rats and not humans.

Addi­tion­al­ly, I have not seen any­one mea­sure the actu­al diam­e­ter of hair to show that cas­tor oil use has thick­ened their hair. Some peo­ple refer to thick­ness as the over­all den­si­ty of hair and in my view again this is not proven by the pic­tures as often they are just refer­ring to nor­mal regrowth.

Could something else be at work?

My the­o­ry in dis­cus­sion with my chief chemist (i.e the hus­band) is that cas­tor oil per­haps can stick to hair more firm­ly than most oils and there­fore cre­ate an illu­sion of thick­ness. Any­one who has used it will note how thick and vis­cous it is. It is almost like a soft glue and tends to stay put and not move when applied. It does not trans­fer eas­i­ly either, which means that it can attract small par­ti­cles of dust and lint which may also add to the illu­sion of thick­ness.

Do you really need to change your hair thickness?

In my view, I think that life and biol­o­gy is about diver­si­ty. Not every­one can have thick hair strands, not every­one can have high den­si­ty hair but every­one can have great hair regard­less of how thick the strand or how dense the hair.

Ladies, do you use cas­tor oil? Has it help improved thick­ness?

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79 Comments on "Does Castor Oil Increase Hair Thickness and Rejuvenate Edges?"

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The best oils to regrow hair is cas­tor and emu oil, they are the two only oils that pen­e­trates fur­ther into the skin and is able to acti­vate the fol­li­cles (besides some essen­tial oils like tea tree, but those need a car­ri­er oil and can irri­tate your skin if you use too much by itself). When you use cas­tor or emu and mixed it with essen­tials oils too, it works even bet­ter. You can make your own oil blends with cas­tor oil, or buy a ready­made blend. One great ven­dor is cnsciousessence. com. Anoth­er tip, spray your edges and parts with… Read more »

how about some­one would test under micro­scope, like see the porous dam­aged hair before and after? in india cas­tor oil is num­ber 1 hair pro­duct, i dont know why, i only enjoy it when i apply night before hair wash, then i wash my hair in the morn­ing and i like the result


Cas­tor oil has anti-fun­gal prop­er­ties, as does tea tree oil, which helps with hair growth. This is why wom­en are also using Monistat cream on their scalp for its anti-fun­gal chem­i­cals that assist with hair growth and oth­er scalp issues (dandruff,etc.). There is sci­en­tific evi­dence.

Try the Cas­tor oil ladies and add tea tree oil and pep­per­mint oil(increases blood cir­cu­la­tion) to the mix if you like. They work.


I use raw cas­tor oil, not the store bought stuff. In the caribbean they sell huge bot­tles at the mar­ket its usu­al­ly dark brown almost black and stinks but that’s why its so good. 

Alot of wom­en use store bought oils that are nowhere close to the nat­u­ral stuff.


The clear yel­low­ish cas­tor oil is nat­u­ral. Black cas­tor oil is dark because ash is added to it. Cas­tor oil is not nat­u­ral­ly black.

Charlette Hernandez

I just pur­chased it and I believe it works and I am gonna use it.


How has it been work­ing for you?

deepali kamre

due to teh typhide i lost my hair my hair became very thin & dull, kind­ly sug­gest me some­thing for hair thick­ness & hair growth my mail id is men­tioned above please sug­gest

Kimberly Diei

Can any type of cas­tor oil be used? In the gro­cery store they sell it as a stim­u­lant lax­a­tive but it says it is cold pressed. Is this type okay to use on hair?


Can cas­tor oil make my hair straight?


I have been using cas­tor oil for so many years. It works real­ly good. It makes hair thick and keeps scalp healthy. Try­out and expe­ri­ence the change. No Oth­er oil make your mane thick in just 1.5–2 months except the cas­tor oil. Don’t wash your hair dai­ly, it could make your hair to fall. If you wan­na go out just cov­er your hair with scarf, as it pro­tects your mane from sun and dust. I do the same. Apply cas­tor oil thrice in a week.


What kind of cas­tor oil do you use? do you have to use JBCO or can Cold Pressed work?


Going to get my hands on that scalp mas­sager, because I’m just too lazy to put my hands up for too long, but you sure it won’t get all nit­ty grit­ty and per­son­al with my hair? I’ve been using JBCO and so far, so good. I think its a GREAT sealant and I used it to mas­sage my edges as they’re also pulled out thanks to braids and wigs with combs.

I had male pat­tern bald­ness, pret­ty sev­ere actu­al­ly because I was total­ly bald by the time I was 30.. tried every­thing in the book (rogain, prope­cia, hair­max comb etc to name the least), noth­ing worked more than some peach fuzz… Then my wife told me how well cas­tor oil was work­ing for her lash­es. SO i decid­ed to use it.. every night, I would wet my head with water a lit­tle and put pure cas­tor oil on (around a tea-spoon full) and go to sleep, next morn­ing would take a show­er (was sure to put thick piece of cloth so it… Read more »

lol they kin­da bash it. It works for me! Made my edges flour­ish. I think my hair likes it. :)


i had a small bald spot at my right tem­ple due to tight braids. i mas­saged that area w/castor oil & the hair grew back nice­ly.


I under­stood fine thank you under­stand by my state­ment.

I don’t mas­sage my scalp at all & cas­tor oil still works for re-growth/thickness and more than avg growth & this has been true for many others–scientific back­ing or not.

The AlizTube

A HEAD MASSAGER. In case you don’t feel like keep­ing both arms up. 

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I live in the UK so it costs 99p … so just over a dol­lar may­be…

The AlizTube

Sor­ry about the HUUUUUGEEEEE pic!!! I was not expect­ing that!!! lolz


This is dis­ap­point­ing news. I have been search­ing for prod­ucts to get back the full­ness I had pri­or to weave dam­age.

The AlizTube
Hey hun, there aren’t any prod­ucts that will do that unfor­tu­nate­ly. Its all about tak­ing good care by nour­ish­ing the hair by wash­ing with sham­poo or con­di­tion­er, apply­ing a hair cream (option­al) and seal­ing with oil on a con­sis­tent basis. I do this every ten days.  A good mas­sage every now and again helps to stim­u­late the blood ves­sels in the scalp. The more you mas­sage, the more it is like­ly to stim­u­late growth. Cos I’m lazy I get my boyfriend to do it prop­er­ly once a week. Then on wash day I do anoth­er light mas­sage in the show­er. Its… Read more »
After, read­ing all the com­ments, tes­ti­monies and unof­fi­cial research on rather or not Jamaican Cas­trol Oil real­ly thick­ens the hair or aids in hair growth, I have decid­ed that I will con­tin­ue pur­chase Jamaican Cas­trol Oil because most of the users seem to ben­e­fit from its use. I am sure rather or not it does what the mak­er of the prod­ucts says it does. How­ev­er, what I am sure of is that the users feel they ben­e­fit from the use of Jamaican Cas­trol Oil. As new con­sumer of Jamaican Cas­trol Oil (Two weeks use) I can­not attest to rather or… Read more »
Shani Jackson
Well I can say that I have been using Jamaican black cas­tor oil and my hair has thick­en up tremen­dous­ly. I have been using it for 1 mon­th and I could not believe what I have been see­ing. Of course I wear pro­tec­tive styles because I do not like comb­ing my hair every day. I have kinky coarse hair. It is shoul­der hair. I wear faux bun with syn­thet­ic hair you tube inspired and I wash my hair once every two weeks. Also I use Jamaican black cas­tor oil every oth­er day. My hair is soft and mois­tur­ized. Try it… Read more »
I’ve had nat­u­ral thin and fine hair my whole life and I don’t see how an oil can change the thick­ness of each indi­vid­u­al strand when its already pre-deter­mined. I’ve used cas­tor oil and you know what it did for me? Left my scalp greasy and that’s it. As for wom­en who said it regrew their edges, have you ever tak­en into con­sid­er­a­tion that its not the oil per se but rather your new tech­niques and the way you care for them now i.e.… “baby­ing your edges”. If you believe cas­tor oil thick­ens hair than by all means dis­re­gard this but… Read more »
Jo Somebody

100% truth!


I swear by Black Jamaican Cas­tor Oil. My scalp loves it and I notice that it pro­motes hair growth for me.


Less manip­u­la­tion of your hair seems to help more than any pro­duct. The less stress you put on your scalp and hair fol­li­cles seems to help it repair itself. When I leave my hair alone, it seems to grow bet­ter. Cas­tor Oil is a just a mois­tur­iz­er to me def­i­nite­ly not a hair growth pro­duct.

I think every­one here has more or less MISSED the point of this arti­cle. It was to illus­trate the effects of MASSAGING the scalp, rather than a reliance on pro­duct. With con­sis­ten­cy (in terms of hair) in tech­nique, results are always seen. We speak of hav­ing a regime and talk­ing about how prod­ucts some­times are not the fac­tor of growth but how it is used in your tech­nique. The respons­es seem like every­one is sug­gest­ing that cas­tor oil is a type of mir­a­cle cure-all, growth aid/thickener. This is not the case, it is the act of how it is used… Read more »
Southern Girl

Hmm I’ve nev­er real­ly mas­saged it in. Just used it in the leave in and to mois­tur­ize my scalp from time to time. I’ll see how the mas­sag­ing works if I can remem­ber to be con­sis­tent with it but I did get much thick­er over the last year sans mas­sage.

Jo Somebody

And NOTHING else changed in how you treat­ed your hair over that year?

Lol I won’t say that I just rely on mas­sages, of course I have a rou­tine pret­ty much the same one since jan­u­ary (usu­al­ly : I wash at least once a week (max 10 days) before the wash I pre-poo, once a mon­th usu­al­ly I make a rhas­soul clay mask, I use water or nat­u­ral gel as mois­tur­iz­er fol­lowed by oils or but­ter mix­es to seal and that’s it). I’m huge fan of mini twist and mini braids too (I tend to neglect my hair, when it’s out for too long). To me the whole lead me here, it’s no… Read more »

Oops I thought the ques­tion was for me XD for­get it

The AlizTube

No, I just mas­saged my head. :)

Give it a try I know many have no spare time but try to get 5 to 15 min­utes a day to do some (while watch­ing some movie or while surf­ing on inter­net, even while talk­ing with friends). I’m not a sci­en­tist so I’ll try to explain it with my own words (plus I’m a french speak­er so it might not sound clear but) it stim­u­lates blood cir­cu­la­tion which I guess means an improvement/increase in the trans­port of oxy­gen and nutri­ents to the scalp. Nutri­ents and oxy­gen play a role in the mak­ing of a strand. By increas­ing or fas­ten­ing… Read more »

I agree ! I swear by mas­sages all day err­day I’m a huge fan and with­out using oil except when I pre-poo and I don’t real­ly focused on putting it on the scalp. I do use cas­tor oil because it does no harm but noth­ing to rave about just a good oil bet­ter for me when mixed with oth­er to make it lighter and that’s it. My hair growth is good and con­sis­tent I guess due to mas­sages and with PS I man­age to retain it .

Here 2 pic­tures one of sum­mer 11 the oth­er sum­mer 12 :

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I use cas­tor oil for mois­ture reten­tion in the win­ter time I think it a bet­ter bar­ri­er for the dry win­ter air and the even dri­er heaters indoors dur­ing that sea­son. It also pro­vides excel­lent hold and seal­ing qual­i­ties dur­ing the oth­er sea­sons.


My hair hates pret­ty much every­thing. But, cas­tor oil mixed with my organix coconut milk it LOVES (on damp hair).….i bought the bot­tle pic­tured in the artile BUT I HATE THE WAY IT SMELLS.…..They sell cas­tor oil with no smell in wal­mart and PERFECTION.……And I repeat my hair hates EVERYTHING but this.…

Southern Girl

I am not sure about any­one else and it def­i­nite­ly didn’t hap­pen overnight but I use JBCO in my leave in and in an oil mix. I use the leave in con­sis­tent­ly and the oils not so much but my hair last August to this August is a lot thick­er, health­ier, and has a much bet­ter shine. I don’t use much on the hair shaft as much as I do my scalp beyond the leave in. It’s nev­er felt heavy unless I was using too much.


what i like most about cas­tor oil is that it lays my hair down. Its a heave oil(for my hair) and weight it down! i like it.


I can’t say it has made my hair thick­er because I nev­er mon­i­tor the thick­ness of my already real­ly thick hair and the oil itself is VERY thick. I just like it as part of my leave in con­di­tion­er mix.




Oh, that’s nice. Thee are hun­dreds if not thou­sands of wom­en of all ages and races on youtube & var­i­ous mes­sage boards that have had suc­cess with cas­tor oil in terms of more than aver­age growth and thick­ness.

Reminds me of sci­en­tists claim­ing for eons that chick­en soup for a cold was just an old wive’s tale and lo and behold after actu­al stud­ies research­es found that Chick­en soup, pre­pared with a vari­ety of veg­eta­bles, inhibits a process that leads to the res­pi­ra­to­ry symp­toms seen with the com­mon cold.


What u said was soooooooooo right mate..

Hmmm I think there is a lit­tle mis­un­der­stand­ing here due to terms. In this case she is talk­ing about actu­al thick­en­ing of a hair fol­li­cle to be thick­er than it was genet­i­cal­ly pre­dis­posed to being. Noth­ing can change that to date or else fine haired nat­u­rals would be all over it. What you and oth­ers are describ­ing as “thick­ness” (as she has men­tioned in her post as well) is the regrowth of hair that may have been stunt­ed or oth­er­wise. That’s an improve­ment in den­si­ty i.e. amount of hair and not strand thick­ness. There doesn’t appear to be an actu­al… Read more »

I dont mas­sage my hair in any way and it grows…castor oil works.


JBCO is awe­some for seal­ing in mois­ture. I use it to seal my ends which has helped with length reten­tion. Rub­bing it along my thinned tem­ples has reju­ve­nat­ed growth in those areas which nev­er hap­pened when I used straight coconut oil or Jane Carter scalp nour­ish­ing serum.


I cur­rent­ly have been using Oyin’s Hand­made Burnt Sug­ar Pomade, in which Cas­tor Oil is the first ingre­di­ent, on my “spacey edges”. I’ve been water­ing my edges (mois­ture) and then apply­ing the pomade (seal­ing) to them twice a day for the last 6 weeks or so and I have had great results! I think Cas­tor Oil is a great sealant and because of that it pro­tects prop­er­ly mois­tur­ized hair and allows for length reten­tion. Check out my post about my “Spacey Edges” Chal­lenge here —>


I have an eye­brow that won’t grow (all the way to the end/length of the oth­er one) and the indi­an lady who threads them for me told me to use cas­tor oil to make it grow. It did work for grow­ing the hair but my hair is already thick so I don’t know if it did any­thing for the thick­ness.


my indi­an friend and the girl who threads my brows both sug­gest­ed cas­tor oil for brows too.

I believe cas­tor oil works. I gave my SIL qhemets amla cream which has a lot of cas­tor oil. Next thing I hear is that my broth­er has had to start going to the bar­ber more fre­quent­ly after he start­ed using it and had to ditch it because of that. He’s a guy and doesn’t mas­sage his hair or do any spe­cial treat­ments. (unless apply­ing the pro­duct counts as mas­sag­ing?) and the qhemet pro­duct was the only thing he changed. I’ve also used cas­tor oil on its own (I dis­cov­ered that avo­cado oil works too) to grow in my eye… Read more »

jbco has helped my hair. i mix it with olvie, coconut and tea tree oil. i used the laven­der jbco and my edges are very full now, now that they were thin­ning out but the jbco mix i use real­ly helped with keep­ing my edges and ends mois­tur­ized.


*not that


I think it grows and pro­tects but not add thick­ness. Real­ly pro­tec­tive in the win­ter


I have use cas­tor oil on my edges for approx. 2 1/2 years and I have noticed a vast improve­ment in the growth of my hair. My hair loss was due to improp­er use of relax­ers, pulling my hair too tight and sul­fate sham­poos. I have elim­i­nat­ed the relax­ers, braids and sul­fate sham­poos and I do believe the cas­tor helped to regrow the hair that I lost. I also use it to seal my hair after apply­ing mois­ture. It is worth a try and it far more afford­able that some oth­er alter­na­tives out there. ;)

“There are no sci­en­tific stud­ies to prove that cas­tor oil can increase hair thick­ness. Inter­est­ing­ly, in the field of male pat­tern bald­ness where hair thick­ness improve­ment is a major require­ment, cas­tor oil does not even fea­ture as a research ingre­di­ent.” this state­ment means noth­ing. i’m a lover of nat­u­ral foods and believe that a whole foods approach to liv­ing makes elim­i­nates many mal­adies. up until recent­ly, the “sci­en­tific” com­mu­ni­ty dis­missed this form of think­ing. absence of stud­ies or cer­tain things not being stud­ied means lit­tle to me in light of said per­spec­tive on food and health. you’ve drawn con­clu­sions based… Read more »
I agree with Mer­ry. My boyfriend is a sci­en­tist, and he likes to pro­claim the supe­ri­or­i­ty of sci­ence. But I believe that his­to­ry itself has proven that sci­ence is not the end all, be all. Remem­ber when we all thought Plu­to was a plan­et? That was “sci­ence” until, well, it wasn’t. I also agree with Merry’s point about the whole foods move­ment not being rec­og­nized by the med­ical estab­lish­ment. Watch­ing doc­u­men­taries like Fat, Sick and Near­ly Dead and The Ger­shon Mir­a­cle have helped me to real­ize that, just like any­thing else, sci­ence and med­i­cine are inun­dat­ed with bias­es and tra­di­tions… Read more »

*neg­a­tive­ly affect


co-sign! she’s say­ing there’s no stud­ies to prove the ben­e­fits, so how can she con­clude that it doesn’t do any­thing? con­tra­dic­tion much?


I tried cas­tor oil one time on my fine hair and it felt like it was stuck to my hair, like a real­ly tacky feel but I want the ben­e­fits so I will try again lol


Dilute it with a lighter oil such as jojoba, coconut, argan etc. and it will dis­trib­ute bet­ter and not feel so heavy on your strands.


I com­plete­ly agree. Try the pro­duct in this link

I won­der if there is a dif­fer­ence between using cas­tor oil and jamaican black cas­tor oil. I know that the process of cre­at­ing jamaican black cas­tor oil is vast­ly dif­fer­ent than just reg­u­lar cas­tor oil because they slow cook or burn the seed. This might infuse some sul­fur into the oil that could help with hair growth (MSM is the sul­fur that i believe is in a lot of hair growth sup­ple­ments that actu­al­ly work but i could be wrong). I have nev­er used reg­u­lar cas­tor oil but I swear by Jamaican black cas­tor oil and incor­po­rate it faith­ful­ly into… Read more »

I don’t know if it reju­ve­nates your hair or not…BUT have I noticed a dif­fer­ence in using cas­tor oil?

YES!!! Water (for mois­ture) and Cas­tor Oil to lock it in and I’ve seen my hair flour­ish. It’s amaz­ing.

I use the cas­tor oil pic­tured above. I just pur­chased a new bot­tle of it. I hope to use JBCO one day.


She didn’t real­ly answer the ques­tion whether it reju­ve­nates edges. Thick­ness is one thing, but if you have some trac­tion alope­cia and you want to recov­er your nor­mal thick­ness back — would cas­tor oil help?

I think she did address it she said this:  “In my opin­ion this is not evi­dence because mas­sag­ing in itself even with plain water can stim­u­late regrowth of hair (i.e where hair has fal­l­en out or been pulled out, mas­sage can help a new strand to grow back). I would add though that the study that showed this was done in rats and not humans.” I think she is say­ing that peo­ple are equat­ing the ben­e­fits of cas­tor oil with cas­tor oil and mas­sage in the case of regrowth. If you are using both cas­tor oil and mas­sage it is dif­fi­cult… Read more »