Hi all I wondered if anyone used Acti-flex or Acti-flex senior without adding extra msm with good results. I volunteer with the local RDA. We're in Singapore, a very urbanised country. There are only 2 riding clubs in the whole country so you can guess supplements are rather expensive and I've decided to buy them from overseas myself for our oldest pony, Chester. Just got the first batch of Majesty's Flex Wafers today but have continued to read up and seen good reports of Acti-flex Senior so thought I would get that when the Majesty's runs out. Chester is about 32 and the oldest in Singapore so he definitely ranks as senior. He's gotten increasingly stiff and also bony around the hips and back. I figure the probiotics could help more. He's currently fed hay, chaff and sugar beet. He either gets no hard feed or a handful of a meusli-mix called Havens (http://www.horsefeed.nl/page3.html) as that's what all our horses get. Salt, electrolytes and vegetable oil. So I figure he gets very little balanced vits and minerals in his feed and the extras in Acti-flex senior might come in handy. He is still used for light sessions 3 or 4 times a week with little kids and has a healthy appetite. He has a reputation for being a grumpy old man but he and I are best mates and he's great with the disabled kids. Anyway, my reason for wanting to go without extra msm if it's still effective is it took a long time to convince our barn manager that we should get supplements for Chester. I'm sponsoring them for now and I just don't want to rock the boat to tell the manager that "er I think this product is good but it's short of something so let's supplement the supplement.." Next qn he's about 750lbs, would that be 2/3 or 3/4 scoop/oz per day rather than 1oz which I read is for a horse weighing 1100lbs? Is there a loading period and dose? So let me know all you Acti-flex users/joint experts out there! Thanks.