Honestly, I did think about taking collagen supplements when I was breastfeeding too, and I spent quite a bit of time weighing whether the ingredients were safe to pass through to baby. The thing is, different products have different formulations, and what's fine for one mum might not suit another, especially when you're nursing. I couldn't find much specific information on this one, so I'd really suggest checking with your PD or gynae first before starting it, just to be safe. Better to get a clear answer from someone who knows your situation than to guess lah.