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For thousands of years, healers have turned to Comfrey — the original "knit-bone" — to mend what modern medicine struggles to reach. The Comfrey Cast is our most concentrated Comfrey formula: pure Kauai-grown Comfrey root, solar-dehydrated at low temperatures to preserve live enzymes, then ground into a potent healing powder.
Mix it with water, apply it to the body, and let it work. It's that simple — and that powerful.
The root holds a significantly higher concentration of allantoin — Comfrey's key cell-regenerating compound — than the leaves. Our root is harvested on our Kauai farm, slow-dried in a solar dehydrator to lock in live enzymes, and ground fresh to preserve full potency.
Note: Comfrey powder will expand considerably when water is added
⚠️ For topical use only. Do not ingest. Comfrey Cast is not an edible product and should never be made into a tea or consumed internally.
5.0 average · 6 verified reviews

Incredible product!!! This is my third or fourth purchase of comfrey cast. Literally healed a broken bone!!! This is a divine product. Absolute blessing from God. I don’t trust any other farm or comfrey product!!! Kauai Farmacy is my go to for healing products, education and ingredient quality and honorable business practice, transparency and excellence in products.
I had sprained my ankle and for 2 days I could not put pressure on my foot. It was painful if it wasn't elevated. When I remembered I had this I applied it overnight. The next morning I had NO pain! I could put pressure on it and walk on it!! I was still limping but I could do it and with little to no pain!. The cast is messy to put on but worth it
I have bunion on my big toe and whenever I walk too much or bend it too far, it hurts for days. I tried using the comfry balm, but didn't experience much benefit. Then, I decided to try the comfrey cast and couldn't believe how much it helped after 2-3 applications. I usually apply it in the evening while watching tv or reading and my toe feel so much better when I wake-up the next morning.
At 81, I was in a tricky position with a break to my dominant arm. I used Comfrey Cast and alternated the Comfrey Salve and also the Comfrey massage oil. I actually 'felt' the healing through a soothing feeling. I just got a report back today that the bone is 'healed' and now we being range of motion. Wow, thank you...
I smashed my little toe when a weight fell on it. My podiatrist took xrays every week for three weeks and it wasn't healing. I used the comfrey cast and within one week the bones were knitting and without any pain! I know recommend it to anyone with a bone or joint issue.
love this stuff!
Very well made and effective comfry salve
The comfrey salve is amazing. Our whole household uses it to relieve muscle and nerve pain. From back injury, injury related Neuropathy, to lyme disease, your salve is elevating the quality of our lives.
I recommend your product to everyone i know.
This salve helps me tremendously thank you
I have been using comfrey salve on arthritic knees for years. When I forget to take in on a vacation, my knees suffer. It helps keep the joints moving! I also have a deteriorating spine. I rub it daily on the parts I can reach. It has helped with frequent headaches and mobility.
Incredible product!!! This is my third or fourth purchase of comfrey cast. Literally healed a broken bone!!! This is a divine product. Absolute blessing from God. I don’t trust any other farm or comfrey product!!! Kauai Farmacy is my go to for healing products, education and ingredient quality and honorable business practice, transparency and excellence in products.
I got this to use on a couple joints in my hands. It seems to be helping ease the pain. I haven’t used it for too long yet, so I’m anxious to see how things improve as time goes on.
I must give a shout out for the excellent customer service I received! After shipping, it appeared to have never left Hawaii within a couple weeks. The post office received it, but it never left Hawaii. I wondered if the package had been lost. I contacted Kauai to see if they could check into it for me and they immediately resent my package. It arrived (this time) in the normal amount of time. I was very impressed with the customer service! Immediate resolution! Thank you so very much!
I purchased your Comfrey Salve to relieve the pain from a damaged ankle tendon and ligament. It was recommended by a friend. The salve did everything I hoped for - calming the inflammation that was causing the pain. Subtlety and effectively. It is a nice product, soothing texture. Quality ingredients. I'm trying it on knee joints, too.
Comfrey Salve has been beneficial is easing muscular aches in my knees and thighs. I use it nightly and I sleep better for it. I also massage it into my hands and wrists and it has greatly reduced the pain of osteoarthritis.
Excellent
I have found this to be so helpful for oainful muscles, joints and bones...
It truly does take away the pain and I use it liberally on sore aching muscles.
Thank You for a Great and pure product that really works.! I will always buy more when I run out.
I usethis primarily on sore over used muscles. Helps relieve the aches from workouts
I have started use this on my arthritic fingers. I feel a difference
Love it!
Love all my products from Kauai Farmacy!
love this stuff!
LOVE THIS BRAND and all their products! 5 Star!!!
We love it!
I have been using this balm for a long time. And every time that I use it I find more ways if healing, like for the tendons! Healing for the whole body. Thank you Kuai Family!
Can’t live without it! Helps with pain so much! Share it with my family and friends!
Thank you!
This salve really helps with the stiffness in my fingers, hands, and arms. This salve helps me continue to play Guitar every day without pain.
I smashed my little toe when a weight fell on it. My podiatrist took xrays every week for three weeks and it wasn't healing. I used the comfrey cast and within one week the bones were knitting and without any pain! I know recommend it to anyone with a bone or joint issue.
Great product!
One night of January 2024 I went to sleep extremely tense and stressed out! I slept really tensed up and woke up with a stiff, extremely painful neck that I couldn't move much and pain in the left side behind the ribs. Chiro and massage helped with my neck but nothing helped for a year for my side pain. I had Chiro adjustments, regular deep tissue massage, epsom salt baths, hot fomentations, ointments with essential oils, nothing helped for a year. I couldn't sleep on my left side at all for that year. I finally had enough and decided to try comfrey religiously. I used it casually but it didn't do anything. I had read so much about the wide benefits of comfrey I decided to try it every night for at least 2 months. After 1 month I was pain free and pregnant haha I have no idea if the comfrey helped with the pregnancy but I wouldn't be surprised. But it DEFINITELY helped with the pain as it's still gone almost 3 months later. All glory and praise to God for His wonderful creation of comfrey! "He causeth the grass to grow for the cattle, and herb for the service of man." Psalm 104:14
Twisted my ankle, lost my balance, and then fell chipping my navicular bone. Applying the comfrey salve twice a day, reduced swelling, bruising and pain. Still not totally recovered, however the healing process has been noticeable and swift. Thank you for taking the time to create products that are clean and natural.
High five for this I spray that I lift heavy stuff and for years now cuz my son's quadruplegic who has never walked since birth and if my neck starts hurting or my anything hurts on me I take that out and spray it on me and I spray it on him and it helps relax his toned up arms and body It really does work.
Love all their products!
Not impressed, does nothing for my hand pain.
At 81, I was in a tricky position with a break to my dominant arm. I used Comfrey Cast and alternated the Comfrey Salve and also the Comfrey massage oil. I actually 'felt' the healing through a soothing feeling. I just got a report back today that the bone is 'healed' and now we being range of motion. Wow, thank you...
I'm so grateful that my Reiki person had some on hand to begin using before I could purchase I used this salve every day. I am 81 and within 6 weeks the bone is healed. Now I begin articulation/range of movement with physical therapy. Also within one weeks the black bruising kept lightening until completely gone. I am grateful. It works, With my age I am going to use the comfrey products on my hips and other bones. Thank you....!!!! It's a beautiful gift of mending.
Works great after hard work outs!
I love this product. I use it on my son and myself. I have a child that had a stroke in uterol and he's been special needs ever since. He can't walk or talk but I use this on him and it keeps him not so stiff. It's a great product and it does work cuz when I lift him every day I use it. If my neck doesn't feel good or my arms hurt, it really works to relieve pain
Frequently asked
Yes. Topical comfrey applied to intact skin is well-tolerated and has been the subject of numerous clinical trials. We recommend external use only and avoid open wounds — see below.
Biodynamically, on our Kauai farm. Grown without chemicals; pests are managed with healthy soil and companion planting. Harvested by hand, dried slowly, and processed on-site.
Varies by condition. Many customers report relief within days for muscle / joint issues; deeper bone or tendon work tends to need 2–6 weeks of consistent use.
Consult your healthcare provider. We don't make claims here — comfrey's pyrrolizidine alkaloid content is a topic to raise with someone who knows your specific situation.
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