@Aireen
I historically have dry skin, so never really have/had a problem with 'break-outs' and other skin related issues.
I gradually went from 3,000 to 5,000 and now 10,000 (but using them in conjunction with another Hair Vitamin).
My 'personal' Milestones are probably more noticeable to me and definitely quicker since upping it to 10,000. ( But I'm really bad at measuring).
I think my growth and retention are both good right now.
I am currently using Phyto Vitamins with the Biotin and was saying in another thread, I don't want to mess it up by switching out the Phyto and another poster said after 18 months the Phyto kinda slowed down on her.
I usually try to switch every year, but I keep Biotin in conjunction with whatever else I am using.
So, I basically went from Nioxin, to Viviscal to Phyto. And so far, for me, Phyto has outperformed the other two. That's why I wanted to keep the Phyto in my line-up.
In 2014 I was taking Viviscal, a former member here, who worked at Sephora, suggested Phyto.
She said coworkers and customers were getting better results from Phyto vs Viviscal. But I had a year's worth of Viviscal in my Stash and wasn't ready to quit or sell them.
But in 2015, I switched over to Phytophanere and they've been great.
I also cleaned up my diet (more fruits, veggies, nuts/seeds)a great deal, and incorporated a ton of water.
I would say all of these adjustments are working great for me.
I hope you get your answers. It couldn't hurt to try the 10,000.