🧬 Family & Essentiality

🌿 Plain-Language Summary

Sulphur mainly comes from protein foods (meat, eggs, legumes, dairy, nuts). It helps build strong hair, skin, nails, powers antioxidant defence via glutathione, and supports detoxification in the liver. Garlic, onions, and broccoli also provide sulphur compounds linked with cell protection.

⚗️ Molecular & Chemical IDs

• Element: S (Sulphur)
• Atomic number: 16
• Common carriers: Methionine, cysteine, inorganic sulphate

⚡ Functions

• Disulphide bonds stabilise protein structure (keratin, collagen)
• Glutathione synthesis — major antioxidant defence
• Sulphation in Phase II liver detoxification
• Metabolic roles in coenzyme A, taurine production

🍽️ Absorption & Bioavailability

🥗 Food Sources

• Protein foods: meat, poultry, fish, eggs, dairy
• Legumes, nuts, seeds
• Alliums (onion, garlic, leek), brassicas (broccoli, cabbage)
• Mineral waters (sulphate content)

🇦🇺 Australian NRVs (NHMRC)

• No specific NRV set for sulphur
• Requirements assumed to be met if dietary protein (methionine + cysteine) is adequate

🚨 Deficiency & Excess

Deficiency

No defined syndrome beyond protein deficiency. Signs overlap with inadequate protein: muscle loss, poor healing, brittle hair/nails.

Excess

High sulphate intake (e.g., certain mineral waters) may cause loose stools; otherwise well tolerated from food.

🧪 Testing & Monitoring

• No direct routine clinical test for total sulphur
• Status inferred from protein adequacy (albumin, nitrogen balance)
• Research use: plasma amino acids, glutathione levels

🔄 Interactions

• Protein quality impacts sulphur amino acid supply
• Drug metabolism depends partly on sulphation pathways
• High sodium intake may increase calcium loss (context of high protein diets)

📊 Evidence Snapshot

• 🔬✅ Well-established: Roles in protein structure, glutathione, detoxification
• 🧪⚖️ Promising/mixed: Sulphur phytochemicals (e.g., sulforaphane in broccoli)
• ⚠️❌ Unproven/hype: MSM supplements for broad “detox” or anti-ageing claims