Chromium (Cr)

🧬 Family & Essentiality

🌿 Plain-Language Summary

Chromium has been linked to insulin function and glucose metabolism, but its status as an essential nutrient in humans remains debated. Deficiency is rare outside of specialised hospital settings (e.g., long-term parenteral nutrition without chromium).

⚗️ Molecular & Chemical IDs

• Element: Cr (Chromium)
• Atomic number: 24
• Dietary forms: Cr(III) complexes in foods (amount varies with soil and processing)

⚡ Functions

• Proposed co-factor in insulin signalling (evidence mixed)
• May influence lipid and carbohydrate metabolism at trace levels

🍽️ Absorption & Bioavailability

🥗 Food Sources

• Whole grains, broccoli, meats, legumes, nuts
• Small amounts may leach from stainless steel processing or cookware

🇦🇺 Australian NRVs (NHMRC)

• AI (Men): 35 µg/day
• AI (Women): 25 µg/day
• Pregnancy: 30 µg/day
• Lactation: 45 µg/day
• UL: Not established for Cr(III); avoid Cr(VI) exposure (toxic)

🚨 Deficiency & Excess

Deficiency (rare)

Observed in long-term parenteral nutrition (TPN) without chromium: may cause impaired glucose tolerance, weight loss, and neuropathy.

Excess

High-dose supplements can cause gastrointestinal upset. Cr(VI) (industrial/occupational) is hazardous and not a nutrient.

🧪 Testing & Monitoring

• No reliable single biomarker of chromium status
• Serum levels do not accurately reflect tissue stores
• Clinical context is more important than lab values

🔄 Interactions

• May interact with diabetes medications — seek medical advice before supplementing
• High refined sugar intake increases chromium losses

📊 Evidence Snapshot

• 🧪⚖️ Mixed: Supplementation shows inconsistent benefits for glucose control
• ⚠️❌ Unproven/hype: Claims for weight-loss or muscle-building in healthy individuals are not supported