A schoolboy campaigner is due to find out whether MSPs will back his call for free vitamin D supplements for children and pregnant women.
Ryan McLaughlin from Glasgow's Drumchapel area began his crusade after watching his mother suffering from multiple sclerosis.
The 14-year-old was backed by 200 supporters who believe vitamin D can help tackle the condition.
Ryan lodged a petition at Holyrood in June, telling politicians: "I am Ryan McLaughlin and I have come here today because my mum has multiple sclerosis.
"It's too late for my mum - we are now waiting for a cure."
Ryan and his supporters are now hoping that MSPs discussing the move on Tuesday will pass it to the Holyrood Health Committee for detailed examination.
The Scottish Government told the campaigners in September that a vitamin D awareness campaign was under "active consideration".
Ministers also said they would issue new guidelines on the use of the supplement by children, pregnant and breastfeeding women.
At the time, free vitamin D supplements for all pregnant and breastfeeding women were ruled out and the Government said it had no plans to introduce the supplements in the form of fortified milk at school.
However, the campaigners have described the Government response so far as "very supportive" and say they are hoping MSPs will take the issue further following Tuesday's discussions.
