I think the jury might be out on this issue .... do lotions and potions really help firm saggy skin?
I tend to side with the opinion that once stretched, nothing you rub on can restore the firmness that was there before because the elasticity has gone. However, I've heard that the massaging action itself is what can help improve the APPEARANCE of wrinkly skin so in that case, anything that facilitates a smooth massaging action should help.
Some people swear by dry brushing (I don't do it so perhaps someone can elaborate) I think it's all to do with stimulating the blood supply to the surface of the skin. Could be worth a try.
Bio oil is more to disguise/prevent stretch marks and scars. It works great for me as I had a couple of faint stretch marks on the top of my arms which have virtually disappeared with using bio oil. Its the best thing ive tried to date as a body lotion too. I only paid £4 from ebay for a sealed 60ml bottle of Bio Oil so you can get it a lot cheaper than £19.99
dry skin brushing - oddly recommended by my nutrionalist!! you need a body brush (available at most chemists) a long handled one is best. Basically you start at the bottom of your body i.e. soles of the feet and brush towards your heart i.e. upwards in long stroking motions. when you get above your heart you brush downwards. remember to do everywhere!! Don't apply too much pressure - it should be tingling rather than scratchy!
the dry brushing not only helps remove dry/dead skins, it helps to break down the toxins under the skin (i.e. fat) to improve the look of cellulite. It's main function is to stimulate the lymphatic system and help remove the toxins that build up over time and get them expelled from your bod.
best to be done 1st thing in the morning - so vitalising , before exercise or before a hot shower/bath! I usually aim for twice a day (morning & night).