The investigators aim at comparing the efficacy of a 2 weeks supplementation by L-citrulline or beetroot juice to L-citrulline placebo or denitrated beetroot juice respectively on Raynaud's phenomenon severity. Raynaud's phenomenon severity will be assessed through the Raynaud Condition Score, daily frequency of attacks or cumulative attack duration (expressed as min) daily collected by patients in a diary. Each Volunteer will choose his own main outcome among these 3 criteria.
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Change in Raynaud Condition Score
Timeframe: first winter: inclusion visit week 2, week 7, week 13, week 19; second winter: inclusion visit week 2,week 7, week 13, week 19
Frequency of RP
Timeframe: 7 days (An attack is defined as an episode of pallor or cyanosis (with or without pain,tingling or numbness). The number of attacks is self-reported every day and averaged over 7-day periods)
Change in cumulative attack duration
Timeframe: first winter: inclusion visit week 2, week 7, week 13, week 19; second winter: inclusion visit week 2,week 7, week 13, week 19