The goal of this trial is to evaluate zinc citrate, a zinc compound with promising sensory properties and a high zinc content, as an alternative zinc compound to be used for supplementation or food fortification. The bioavailability of zinc citrate given as a supplement to young Swiss adults will be assessed and compared to the bioavailability of the commonly used zinc compounds zinc gluconate and zinc oxide.

Inclusion Criteria:

• Male or female of 18 to 45 years old
• Body Mass Index in the range of 19 to 25
• No mineral and vitamin supplements two weeks prior to the study and during the whole duration of the study

Exclusion Criteria:

• Any metabolic, gastrointestinal or chronic disease (according to the subjects own statement)
• Long-term medication during the whole study (except for contraceptives)
• Vegans
• Pregnancy
• Lactation
• Intention to become pregnant during the course of the study
• Lack of safe contraception
• Consumption of mineral and vitamin supplements within 2 weeks prior to 1st test supplement administration
• Earlier participation in any nutrition study using Zn stable isotopes as well as participation in any other clinical study within the last 30 days and during this study