Jane inc. - Muscle Ache Effervescent Cube Sale! from $10.00 Qty. Add to Cart This item is currently on backorder but you can still purchase it now and we'll ship as soon as more become available. Essential Oil Bath Bomb for Sore Muscle Relief. Each huge bath cube has been lovingly hand-crafted and formulated to heal and delight! Ingredients: Sodium Bicarbonate Citric Acid Epsom Salts Sea Salt Green Tea Spirulina Essential Oils of Cardamom, Cinnamon, and Clove