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Check sulfur intake from protein — see grams/day and % of estimated needs.
Check sulfur intake from protein — see grams/day and % of estimated needs.
Enter values above and click Calculate — results will appear here with the formula explained.
Sulfur is an essential element found in the amino acids methionine and cysteine, making it a structural component of every protein in your body. It also features in glutathione (your master antioxidant), taurine, and several vitamins and coenzymes. Despite being the third most abundant mineral in your body (after calcium and phosphorus), sulfur has no official RDA — only an estimated adequate intake based on sulfur-containing amino acids, roughly 13 mg/kg body weight daily (≈ 1,000 mg for a 75 kg adult).
Protein is the primary sulfur vehicle: meat, fish, eggs, dairy, legumes, and alliums (garlic, onions) deliver sulfur via methionine, cysteine, and glutathione. Cruciferous vegetables (broccoli, cabbage, kale) add glucosinolates, which break down into sulfur compounds with studied health benefits. Animal proteins typically provide 3–6 mg sulfur per gram of protein.
Sulfur-containing compounds like MSM (methylsulfonylmethane), glucosamine sulfate, and chondroitin sulfate are popular joint supplements — the sulfate moiety supplies bioavailable sulfur. However, evidence for joint benefits is mixed, and the sulfate form is already abundant in a protein-adequate diet.
Sulfur deficiency is virtually nonexistent in protein-adequate diets — the amino acid requirement automatically covers sulfur needs. Excess sulfur from high animal protein can increase urine calcium loss and acid load, which the kidneys handle unless kidney function is impaired. No UL is established, but the WHO notes intakes above 1,000 mg/kg body weight may cause gastrointestinal distress.
Sulfur's role in glutathione makes it central to antioxidant defense and liver detoxification pathways. N-acetylcysteine (NAC) replenishes glutathione and is used clinically for acetaminophen overdose and COPD — both leverage sulfur's redox chemistry. Garlic and onions concentrate sulfur compounds (allicin, diallyl sulfides) with antimicrobial and cardiovascular research backing, though doses in food are modest.
For most people, this calculator simply confirms adequacy: adequate protein intake (0.8–1.6 g/kg) automatically supplies 1.5–3× the estimated sulfur need. Restriction is only relevant in rare metabolic disorders (e.g., sulfite oxidase deficiency) or extreme protein restriction — consult a clinician, not a calculator.
Check sulfur intake from protein — see grams/day and % of estimated needs. Formula: Sulfur ~ protein*0.02g (2% of protein is sulfur amino acids). Example: With 70 kg body weight: estimated sulfur need ≈ 910 mg/day.
Sulfur is an essential element found in the amino acids methionine and cysteine, making it a structural component of every protein in your body. It also features in glutathione (your master antioxidant), taurine, and several vitamins and coenzymes. Despite being the third most abundant mineral in your body (after calcium and phosphorus), sulfur has no official RDA — only an estimated adequate intake based on sulfur-containing amino acids, roughly 13 mg/kg body weight daily (≈ 1,000 mg for a 75 kg adult).
Protein is the primary sulfur vehicle: meat, fish, eggs, dairy, legumes, and alliums (garlic, onions) deliver sulfur via methionine, cysteine, and glutathione. Cruciferous vegetables (broccoli, cabbage, kale) add glucosinolates, which break down into sulfur compounds with studied health benefits. Animal proteins typically provide 3–6 mg sulfur per gram of protein.
Sulfur-containing compounds like MSM (methylsulfonylmethane), glucosamine sulfate, and chondroitin sulfate are popular joint supplements — the sulfate moiety supplies bioavailable sulfur. However, evidence for joint benefits is mixed, and the sulfate form is already abundant in a protein-adequate diet.
Sulfur deficiency is virtually nonexistent in protein-adequate diets — the amino acid requirement automatically covers sulfur needs. Excess sulfur from high animal protein can increase urine calcium loss and acid load, which the kidneys handle unless kidney function is impaired. No UL is established, but the WHO notes intakes above 1,000 mg/kg body weight may cause gastrointestinal distress.
Sulfur's role in glutathione makes it central to antioxidant defense and liver detoxification pathways. N-acetylcysteine (NAC) replenishes glutathione and is used clinically for acetaminophen overdose and COPD — both leverage sulfur's redox chemistry. Garlic and onions concentrate sulfur compounds (allicin, diallyl sulfides) with antimicrobial and cardiovascular research backing, though doses in food are modest.
For most people, this calculator simply confirms adequacy: adequate protein intake (0.8–1.6 g/kg) automatically supplies 1.5–3× the estimated sulfur need. Restriction is only relevant in rare metabolic disorders (e.g., sulfite oxidase deficiency) or extreme protein restriction — consult a clinician, not a calculator.
With 70 kg body weight: estimated sulfur need ≈ 910 mg/day. At 1.2 g/kg protein (84 g protein), estimated sulfur intake ~500–1000 mg — adequate. A 3-day average including a weekend day smooths daily variation — weekend intake often 20–30% higher.
Last reviewed: September 2026 · Report an error