Hi, I have gone through your question. Blood supply to the fetus can be assessed only by doing a colour Doppler ultrasound. Growth restriction of the fetus can be due to various causes like 1. Inadequate maternal nutrition 2. Inadequate blood supply to the fetus 3. Some anomaly in the fetus 4. Maternal diseases like hypertension, diabetes or autoimmune diseases. ARG 9 powder is protein supplement containing arginine, which is a amino acid and it has no proven role in increasing the blood supply to the fetus. I would suggest you to consult an OBGYN specialist to get properly examined, get a detailed anomaly ultrasound with colour Doppler done and further management should be done accordingly. Hope you found the answer helpful. Wishing you good health.