Rhodiola Rosea 500mg, 3% Rosavins

Description

Rhodiola rosea 500mg standardised to 3 percent rosavins and 1 percent salidroside, with both figures measured on the lot rather than copied from a specification sheet. Two markers matter on this plant and most labels print one or neither. A rhodiola rosea 500mg capsule at those percentages carries about 15 mg of rosavins and 5 mg of salidroside, and that 3 to 1 ratio is the one found in the authentic root.

On the panel

Why rhodiola rosea 500mg needs two numbers rather than one

Rosavins are close to unique to this species. Salidroside is not, and appears in several relatives. A label quoting only salidroside is therefore quoting a figure that could be met by a different plant entirely, and that is precisely the gap substitution exploits. Quoting both, at the ratio the real root carries, is a much harder specification to fake.

This is the clearest example on the shelf of why the herbals page insists on species, plant part and marker percentage together. Any one of the three on its own leaves room for a cheaper plant.

The substitution problem, stated plainly

Rhodiola crenulata is a cheaper relative that has been found repeatedly in products labelled as Rhodiola rosea, in published analyses of retail samples. It contains salidroside and little or no rosavin. This is not a rumour in the trade, it is documented, and it is the reason identity testing on this particular plant is worth more than potency testing.

What the trials administered

Controlled studies have mostly used 200 to 600 mg a day of a standardised extract over two to twelve weeks, with endpoints including fatigue rating scales, burnout questionnaires, cognitive task performance and self reported stress measures. Several used an extract standardised to the same 3 and 1 percent figures. That is a description of the doses given and the instruments read, and it is not a claim about this bottle.

Timing, from the protocols

Trials generally dosed in the morning or early afternoon, and the plant has a reputation for being activating enough to interfere with sleep when taken late. Taking a rhodiola rosea 500mg capsule at nine in the evening is a decision some people regret. The protocols also usually dosed before food rather than after.

Root, not leaf or stem

In rhodiola rosea 500mg capsules the root and rhizome carry the marker compounds and the research record. Aerial parts are cheaper and different. Plant part is on the panel because a milled brown powder gives no visual clue which part of a plant it came from, and because the distinction changes what is in the capsule.

What a rhodiola rosea 500mg bottle costs to run

Price divided by servings is the figure, and it sits under the price as cost per milligram of marker compound rather than per milligram of extract. That is the honest denominator on a standardised botanical, because two bottles at the same extract weight can differ threefold in rosavin content. A rhodiola rosea 500mg capsule with both markers measured is comparable. One with neither is not.

Interactions

This plant has reported interactions with antidepressant medication and with some stimulants, and anyone on prescription medicine should raise it with a pharmacist before the first capsule. The NCCIH herbs at a glance series gives a short, free government summary of what has been studied and what the cautions are.

Testing and identity

An independent laboratory confirms species identity, measures both marker percentages and screens heavy metals, pesticides and microbials on every lot of rhodiola rosea 500mg. Lots failing identity or potency are withdrawn from sale and the failing certificate stays published, which is the practice described in why we publish the batch that failed. Your lot report is linked above.