Yes the cost is a downside. I took them religiously until 18 weeks. Now I take them only to suppliment my diet. If I feel I've eaten really good foods and have covered most of my bases I won't take them. If I feel I haven't eaten so well I may take one (I take Blackmores which is 2 tablets a day) and if I've eaten absolute crud for food I take both. It makes them last longer and they are only meant to suppliment your diet.