想給長輩買Glucosamine，請問這兩種的區別

Natures Way Joint Restore For 50+ Tablets 60
含：Natures Way Joint Restore For 50+ Tablets 60 Joints, Bones and Muscles Glucosamine 750mg Chondroitin 200mg Calcium 300mcg Vitamin D3 12.5mcg Manganese 1.5mg Boron 1.0mg

Blackmores Glucosamine Sulfate 1500mg One-A-Day 180 Tablets
含：Active ingredient per tablet: Glucosamine sulfate sodium chloride complex 1.9 g (1884 mg) Equivalent to glucosamine sulfate 1.5 g (1500 mg) No added yeast, gluten, wheat, milk derivatives, preservatives, artificial

當然，後者比較便宜，不知道後者有效果不？如果有效果我先買後者的，如果無效，那當然隻能買前者了
含量表雖然看的懂，可是看懂那些名詞是什麽意思，也一樣不知道是不是有必要補啊@_@求大家幫忙指導下blackmore那個可以不？