TL;DR

“Vitamin U” isn’t a vitamin at all—it’s S-methylmethionine, a compound found in cabbage and other cruciferous vegetables. Research dating back to the 1950s suggests it may help protect the stomach and intestinal lining, support ulcer and reflux healing, and possibly protect the liver from certain toxins.

What Is “Vitamin U”?

Vitamin U is a naturally occurring derivative of the amino acid methionine. It’s found in cabbage, Brussels sprouts, kale, spinach, and other green vegetables. Although not an essential vitamin, it earned its name after early clinical studies linked cabbage juice to improved ulcer healing.

Early Research: Cabbage Juice and Ulcer Healing

In the 1950s, Dr. Garnett Cheney of Stanford University published a series of studies examining concentrated cabbage juice for peptic ulcers. In one double-blind, placebo-controlled trial [1], ulcer patients were treated for 22 days. X-ray evaluation showed faster healing in those receiving cabbage juice compared with placebo. Cheney published several similar reports through that decade, each suggesting that S-methylmethionine supported mucosal repair.

Additional Findings

Later animal studies reinforced these protective effects.They found that methionine derivatives may help reduce inflammation in ulcerative colitis, hinting at broader roles for this compound in maintaining intestinal integrity [2-8].

Beyond the digestive tract, S-methylmethionine has shown potential to protect the liver against acetaminophen-induced injury by mitigating oxidative stress. Other emerging evidence links it with reduced allergic reactivity and modest improvements in cholesterol metabolism, though human data remain limited.

Sulfhydryl Compounds and Gut Protection

Compounds containing sulfur groups (–SH), including S-methylmethionine, appear to protect the intestinal lining by maintaining antioxidant defenses and promoting tissue repair. A randomized, double-blind study found that sulphydryl-containing agents played an important role in protecting against recurrent ulcerative colitis flares, reinforcing the therapeutic potential of this chemical class.

Dietary Sources and Natural Support

While supplements exist, food sources remain the simplest and safest way to obtain S-methylmethionine. Fresh cabbage juice, sauerkraut brine, and other cruciferous vegetables are traditional digestive tonics that provide this compound naturally.
In natural healthcare, these foods are often incorporated into protocols that focus on soothing the GI tract, reducing inflammation, and supporting detoxification.

Key Takeaway

Vitamin U (S-methylmethionine) is an old but intriguing concept with renewed relevance today. Though not a true vitamin, it may help protect and heal the digestive lining, reduce inflammation, and support liver health. Eating cruciferous vegetables—or cabbage juice, the original “vitamin U” source—remains a safe, evidence-inspired way to support digestive wellness.

Disclaimer

This information is for educational purposes only and is not intended as medical advice.

References:

  1. (Calif Med. 1956 Jan;84(1):39-42) Vitamin U therapy of peptic ulcer; experience at San Quentin Prison
  2. “Anti-peptic ulcer dietary factor (vitamin “U”) in the treatment of peptic ulcer”. J Am Diet Assoc. 26 (9): 668–72.
  3. Rapid healing of peptic ulcers in patients receiving fresh cabbage juice. CHENEY G.Calif Med. 1949 Jan;70(1):10-5.PMID: 18104715
  4. Gut. 1996 Jul;39(1):77-81 Methionine derivatives diminish sulphide damage to colonocytes–implications for ulcerative colitis
  5. 1992;45(3):170-80. Sulphydryl-containing agents stimulate the healing of duodenal ulceration in man
  6. Can J Surg. 1993 Feb;36(1):53-8. Sulfhydryl-containing agents in the treatment of gastric bleeding induced by nonsteroidal anti-inflammatory drugs
  7. Vopr Pitan. 2018;87(5):70-76. [S-methylmethionin (vitamin U): experimental studies and clinical perspective]
  8. 1992;45(6):307-18. Role of sulphydryl-containing agents in the management of recurrent attacks of ulcerative colitis.
  9. (Pharmacology 1992; 45(6):307-18) Role of sulphydryl-containing agents in the management of recurrent attacks of ulcerative colitis. A new approach