

1 dose of Defence potion.
Defence potion(1) has a wide margin right now: instant buys at 200 gp against instant sells at 188 gp, 6.4% apart. After the 2% Grand Exchange tax, the margin leaves 8 gp profit per item. Over the past week its average price has dropped sharply, by 26%. It is close to the bottom of its 91-day range. It is thinly traded. About 206 units traded in the last day, less than the 4-hour buy limit of 2,000. GrandExchanger counts it in the Herbs & Potions sector. It is a members-only item. Game facts on the OSRS Wiki

0 buy · 1 sell · 0 neutral
Positive momentum: the short-term trend is pushing the price up.
Within normal trading range.
Above VWAP: trading above the average. A possible time to take profit.
Momentum is neutral.
Moderate volatility: typical price movement.
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