As of 2015, there is not enough relevant scientific data to determine appropriate dosing of Chia seeds, which limits information concerning side effects, according to WebMD. Chia may increase triglyceride levels in people who already have high levels and may increase the risk of prostrate cancer.
Chia may be safe to consume for up to 12 weeks or use topically for up to eight weeks, according to WebMD. However, consumption of chia while pregnant or breastfeeding is not recommended because there is a lack of data supporting its safety. Chia is thought to be ineffective as a weight loss supplement for men and women. Research in early stages also suggests that chia seeds do not help athletes perform better than athletes who do not consume chia.
Early research does suggest that using chia to reduce itching of the skin may be effective, notes WebMD. Evidence also suggests that consuming 500 fewer calories per day for two months while including a drink that contains chia, soy protein, oat and nopal may reduce body weight, the size of the waist and body mass index in people who have metabolic syndrome. It should be noted that people who only reduce their calories and do not consume the drink have very similar results.