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headache, nausea, and skin rash.
Special Precautions & Warnings:Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking threonine if you are pregnant or breast-feeding. Stay on the safe side and avoid use.
Amyotrophic lateral sclerosis (Lou Gehrig's disease):There is some concern that threonine might decrease lung function in patients with ALS. In one study, ALS patients taking 1 gram of threonine four times per day for 6 months had significantly reduced lung function compared to patients who did not receive threonine. More evidence is needed to determine if threonine was actually at fault.
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