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Vitamin U S-methylmethionine 500 mg supplement bottle
Vitamin U S-methylmethionine 500 mg supplement bottle
Vitamin U capsule, 500 mg S-methylmethionine
Supplement facts panel: 500 mg S-methylmethionine per capsule, 60 capsules

S-METHYLMETHIONINE • 500MG • 60 CAPSULES

Vitamin U

S-methylmethionine is the active compound in cabbage juice. Clean formula. Made in the USA.

Supports stomach lining.*

$49 USD

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MADE IN USA
LAB TESTED 3RD-PARTY
CAPSULE VEGAN
RETURNS 30-DAY
S-methylmethionine, Vitamin U or SMM, is a vitamin-like compound found in raw, cruciferous vegetables such as cabbage, broccoli, and kale.
  • Supports the integrity of the gastrointestinal mucosal lining.*
  • Helps maintain normal digestive comfort.*
  • Acts as a methyl donor and antioxidant for everyday health.*
Take 1 capsule once or twice daily with food, or as directed by your healthcare professional.
VitaminYOU is manufactured with our customers in mind. Made in the USA, in cGMP-compliant facilities. Every batch is tested by a 3rd-party lab. If you are not 100% satisfied, we offer a 30-day money-back guarantee.
See all the questions ↓
1950s
FIRST IDENTIFIED
AT STANFORD
1
ACTIVE
INGREDIENT
1 litre
OF CABBAGE JUICE
PER CAPSULE
500 mg
PER CAPSULE
PER SERVING
VS. CABBAGE JUICE

All the active compound.
None of the cabbage juice.

S-methylmethionine is the active compound in raw cabbage juice. When people drink it for stomach issues, Vitamin U is what they're getting. Cabbage contains 53 to 104 mg per 100 g,2 so reaching 500 mg means drinking about a litre.

500 mg
per capsule
1 liter
of cabbage juice to match it

No compromises.

Every decision in this formula was made for the person who's already tried everything.

Made in the USA

Formulated and manufactured in the United States in a registered facility.

GMP compliant

Made to Good Manufacturing Practice standards for consistency and safety.

3rd-party lab tested

Every batch tested by an independent laboratory for purity and potency.

30-day money-back guarantee

Not satisfied for any reason? Contact us within 30 days for a full refund.

Questions

Still stuck? Email hello@vitaminyou.shop and a person answers.

No. Vitamins are nutrients your body can't make and has to get from food. S-methylmethionine doesn't meet that definition. The name came from 1950s research and never went away.
It's the official name for Vitamin U. A sulfur-containing compound that plants make from the amino acid methionine, found in cruciferous vegetables and most of all in raw cabbage.
Cabbage, kale, Brussels sprouts and broccoli, with smaller amounts in celery, asparagus and spinach. Raw cabbage juice is the most concentrated food source.
You'd need about a litre of raw cabbage juice to get the 500 mg that's in one capsule. It also has to be made fresh, and it tastes like raw cabbage juice.
One to two capsules a day with food.
Yes. The capsule shell is hypromellose, which is plant-derived.
Because of what's in them. S-methylmethionine has a natural sulfur note. Keep the bottle sealed and somewhere cool and dry.
In the United States, in a cGMP-compliant facility.
Yes, if you're pregnant, breastfeeding, or taking prescription medication.
No, and no supplement is. Under US law the FDA doesn't approve dietary supplements individually. The facility is FDA-registered and cGMP-compliant and the label follows FDA rules.
Yes. Above the Add to cart button, choose deliver every month or every 2 months instead of one-time purchase. You save 10% on every order, not only the first.
Click the account icon at the top of any page, enter your email, and we send you a 6-digit code to sign in. Then open Subscriptions and click Manage. No minimum, no fee, and no need to email us.
A bottle is 60 capsules. Two capsules a day is a monthly bottle. One a day is every 2 months. You can change it whenever you like.
All 50 US states, and Canada.
Orders go out in 1 to 2 business days, then usually 3 to 7 business days to arrive.
30 days. Email hello@vitaminyou.shop and we'll refund you in full. You don't need to send the bottle back.
References

1. Watanabe et al., on gastric mucin in animal and cell studies. Reviewed in Ananian et al., Pharmaceuticals 19(5):743, 2026.

2. Determination of Vitamin U in Food Plants, Food Science and Technology Research 9(4):316, 2003.