The majority of pregnant women do not complain of morning sickness until the 6th week of pregnancy, 2 weeks after a missed period. But for some women, that nagging feeling can start as early as one week after conception, a full week before a missed period. Changes in hormones account for the queasiness that occurs.
DRUG CLASS AND MECHANISM: Niacin (nicotinic acid, vitamin B3) is a part of the normal diet that is essential to various chemical reactions in the body.
Niacin / Vitamin B3. Vitamin B3 is also known as niacin or nicotinic acid. Niacin has important benefits, as it helps to rid the body of toxic chemicals and it is crucial for the healthy function of numerous enzymes in the body.