The recommended daily intake of magnesium bisglycinate for adults generally ranges between 200 mg to 420 mg of elemental magnesium per day, depending on age and gender. Typical recommendations are:

• Men aged 19-30 years: 400 mg/day
• Men aged 31 years and older: 420 mg/day
• Women aged 19-30 years: 310 mg/day
• Women aged 31 years and older: 320 mg/day
• Pregnant women: 350-400 mg/day

Magnesium bisglycinate is best taken with food to enhance absorption and can be split into two doses (morning and evening) if taking higher amounts. Excessive intake above about 500-600 mg per day may cause side effects like diarrhea or stomach upset, so it's advised to stay within recommended dosages and consult a healthcare provider for personalized advice.