The manufacturer gives neither the length of a course nor any timeframe in which to expect a result. The recommended daily dose and method of use are on the packaging — follow them and do not exceed the recommended daily amount.
If marked discomfort appears after you start taking it, it is sensible to take a break and consult a specialist; during pregnancy and breastfeeding, consult a doctor before taking it. The supplement is not a substitute for a complete and varied diet and is not intended to treat or prevent diseases; it is important to keep to a balanced diet and a healthy lifestyle.