What it does in the body
- Protein structure (disulfide bonds in keratin, collagen)
- Antioxidant defense (glutathione synthesis)
- Detoxification (sulfation in liver Phase II metabolism)
- Coenzyme function (CoA, biotin, thiamine)
- Joint and connective tissue health (chondroitin sulfate, glucosamine sulfate)
How much you need (Daily Value)
| Group | Recommended | Source |
|---|---|---|
| Adult male | No RDA; approximately 900 mg obtained with adequate protein | Estimated from protein intake |
| Adult female | No RDA; approximately 750 mg obtained with adequate protein | Estimated from protein intake |
| Pregnancy | No RDA; increases with protein needs | Estimated |
| Children | No RDA; proportional to protein needs | Estimated |
| Older adults | No RDA; ensure adequate protein for sulfur amino acid intake | Estimated |
Richest food sources
| Food | Amount | Where |
|---|---|---|
| Eggs | 180 mg per 100g | global |
| Chicken breast | 300 mg per 100g | global |
| Garlic | 70 mg per 100g | global |
| Onions | 50 mg per 100g | global |
| Broccoli | 100 mg per 100g | global |
| Fish (cod) | 230 mg per 100g | global |
| Beef | 280 mg per 100g | global |
| Brussels sprouts | 80 mg per 100g | Europe/Americas |
If you don't get enough
Mild: Brittle nails, dull hair, slow wound healing
Moderate: Joint stiffness, impaired detoxification, skin problems
Severe: Not observed independently — sulfur deficiency reflects severe protein malnutrition
Time to onset: Months of severely inadequate protein intake
Too much
Upper limit: No established UL. Excessive sulfur from supplements (MSM) is generally well tolerated up to 3-6 g/day.
GI discomfort at high supplemental doses. Hydrogen sulfide gas (from sulfur-reducing gut bacteria) may cause bloating and flatulence with excess sulfur-rich food.
How well you absorb it
Absorbed as sulfur-containing amino acids (methionine, cysteine) with protein digestion; highly bioavailable from animal proteins
Helped by: Adequate protein intake, Vitamin B6 (required for transsulfuration pathway), Folate and B12 (methionine cycle)
Hindered by: Very low protein diets, Impaired gut absorption
Cooking & storage
Sulfur compounds in cruciferous vegetables (broccoli, cabbage) and alliums (garlic, onions) are volatile and partially lost with prolonged cooking. Light cooking preserves more beneficial sulfur compounds. Overcooking produces hydrogen sulfide (characteristic rotten egg smell).
Nutrisize Health totals every nutrient from what you actually eat, against targets set for your age and sex, and flags what's short — across 4,995 foods, on your device.
